First Published in the UCD College Tribune
Humans have an incredibly extensive waste problem. Right now, most of that waste is sent to landfills where it takes up space for thousands of years, leaching harmful chemicals and gases into the soil and atmosphere. Alternatively, we send our waste to incinerators which burn it for energy, but which release harmful greenhouse gases (GHGs) and toxic by-products in the process. A large proportion of our plastic waste ends up in the ocean, where it strangles and poisons fish, seabirds and marine mammals. What if I told you that there was a way to get rid of almost any type of waste in one machine, that the machine would release no harmful chemicals or GHGs, and that the process would produce useful by-products and excess energy that could be sold back to the grid? Such a machine exists right now; the plasma waste converter (PWC).
While incinerators are able to extract about 15% of the potential energy from rubbish, PWCs can extract an incredible 80% through a process called ‘gasification’. Plasma is ionised gas, meaning that it contains roughly equal numbers of positively charged ions and negatively charged electrons. It is often called the fourth state of matter since its characteristics are so different to those of liquids, solids and gases.
One way you can make plasma is by creating an arc of electricity between two rods, then passing a gas like argon through it. This set-up is known as a plasma torch and can heat gases to a higher temperature than the surface of the sun. Plasma torches were invented by NASA in the 60s to test how much heat the hulls of their spaceships could withstand. The crucial difference between using a plasma torch and using an incinerator is that in PWCs, combustion doesn’t take place. That means no smoke, no GHGs and no ash. The plasma breaks down the bonds between atoms, separating them into very simple forms. Despite the extremely high temperatures, it would be wrong to say that the waste is being ‘burned’; rather it is being decomposed at an accelerated rate.
One of the products of gasification is, you guessed it, gas. This energy-rich gas, known as syngas, is largely made up of hydrogen and carbon monoxide. Syngas mainly comes from the gasification of organic matter. As the gas expands, it spins a turbine, generating electricity. The high temperature of the gas can also be used to evaporate water, generating steam to turn another turbine. The syngas itself can then be burned for fuel or scrubbed with water and released safely. Remember, all of this energy production and revenue is coming from rubbish. We are talking about the plastics that are decimating marine life. Metals, fabrics, wood, even toxic or hazardous waste from industrial run-off or medical facilities. This is stuff that we desperately need to get rid of and by getting rid of it like this, we can also take some of the stress off an already strained energy production sector.
The solid by-product of gasification is called ‘slag’. Slag is produced mainly from inorganic materials like metals. It can be used in construction to bulk up concrete and tarmac, making it a very useful commodity. The molten slag also pools at the bottom of the chamber and helps to maintain the temperature, reducing the energy consumption of the PWC. The real magic happens when you pass compressed air through molten slag to create a material known as ‘rock wool’. Rock wool is currently made by drilling into rock, melting it down and spinning it in a centrifuge. Made in this way, rock wool is sold at one US dollar per pound. When it’s made of rubbish instead, it can be sold at just ten cent per pound.
Rock wool can be used in a number of ways. As an insulation material, it is twice as efficient as fibreglass and could significantly decrease heating and air conditioning bills, further reducing the carbon footprint of gasification. Surprisingly, you can also hydroponically grow plants from seed in rock wool. Perhaps its most amazing use is that it can clean up oil spills. Rock wool is lighter than water and extremely absorbent. This means that if you spread it out over the surface of an oil spill, it will float and absorb all the oil. The rock wool can then be collected with relative ease. Slag and rock wool are two more saleable products that can increase the economic viability of plasma waste conversion.
PWCs are currently being built all around the world. Some plants are already so efficient that they need to take rubbish out of landfills to use as feedstock. There is even a mobile plasma torch on the back of a truck in the US which can be jammed straight into landfills, which act as makeshift gasification chambers. The need to reduce GHG emissions and simultaneously fix our massive waste problem has generated huge interest in PWCs in recent years. Landfills have only one way to make money; they charge you a ‘tipping fee’ for getting rid of your waste. Since PWCs can generate revenue from both energy production and by-products, they can make their tipping fees much more competitive.
So why haven’t these things solved the problems of pollution and climate change already? The answer is largely that PWCs are still a relatively new technology. The cost of building and operating one is still much higher than that of some of its competitors including landfills and incinerators. There has not yet been standardisation of the design and thus the huge and complex machinery must be custom-built every time. The energy needed to power PWCs is also very high, especially compared to incineration, which requires only a match. It must be said, however, that although it takes a lot of energy to run a PWC, you will very quickly make all that energy back and more. PWCs are extremely efficient long-term; unfortunately, short-term profits dictate much of what happens in society.
One worry is that by making waste a profitable commodity, we encourage people and companies to keep polluting with impunity. The best way to solve pollution is not to pollute more and then clean it up better. It is to reduce the amount of pollution we are producing, whether that is by reducing our individual consumption, or by researching innovative ways to package our goods without making a mess. There is, on the other hand, already a lot of waste out there, languishing in landfills and contributing to the decimation of marine ecosystems. The best thing to do with all that waste is to get rid of it with the fewest possible emissions and the most possible benefits. PWCs may be just the technology for the job.
The price of fossil fuels is slowly being raised by various economic policies to reflect the cost to life on earth and we need to find as many alternative sources of energy as we can. With countless landfills already full and the world still producing around 2 billion tonnes of waste per year, rubbish will not be scarce for a very long time. This really is a win win win win win. One machine can get rid of harmful waste, cut GHG emissions, produce fuel, energy and construction materials and clean up oil spills all while making a profit. An investment in plasma waste converters is not only economically sound, it is also an investment in the future of our planet.
First published in UCD College Tribune
A report released in 2017 found that over half of all global emissions since 1988 have been produced by just 25 companies. When you take into account the 100 most environmentally damaging companies, known as the ‘Carbon Majors’, that figure rises to over 70%. In October of 2019 (during rebellion week), the Guardian reported that just 20 companies have been responsible for 35% of all emissions since 1965; the point at which experts say that both government and industry were fully aware of the dangers of fossil fuels.
Even so, we are constantly told that individual actions like using canvas bags and taking the bus will be enough to avoid the catastrophic effects of climate change. The truth is that the onus is on the major greenhouse gas emitters like Exxon Mobil and Shell Oil to simply stop extracting and distributing fossil fuels. Unfortunately, the pressures of the competitive market mean that they are not going to do this without a push.
As things stand, it makes more financial sense to use fossil fuels than renewable alternatives. However, there are many ways that governments can curtail the emissions of Carbon Majors through financial and legal incentives. A fundamental of the modern nation state is that the legislator should tax practices which they aim to discourage in society. This is why smoking is so expensive. Governments realised that by taxing cigarettes at an extremely high rate, they could better public health and make some serious dough while they were at it.
By raising the price of smokes, governments can gradually decrease the number of smokers which in turn decreases the amount they have to spend on the treatment of diseases like lung cancer and emphysema. In theory, this increase in revenue can be put towards things like medical services and anti-smoking campaigns. This essentially means that governments can shift the costs that smoking imposes upon society onto those who actually smoke.
Similarly, governments can tax the use of dirty fuels which emit CO2 and use the extra cash to invest in renewable energy research. Some form of ‘carbon tax’ has already been introduced in 46 countries, including Ireland, Canada and Australia. Carbon tax means that fuels which result in higher carbon dioxide emissions are taxed at a higher rate, a policy which is all ‘stick’ and no ‘carrot’.
By taxing carbon, governments can cut into the profits of companies who would otherwise be making a killing on fossil fuels. The hope is that Carbon Majors will then be incentivised to move toward renewable energies like solar and wind power. While a higher carbon tax would mean an increase in the prices of fuels like petrol, coal and gas for the consumer, it would also mean that clean energy sources could become more competitive.
The other side of the coin is renewable energy subsidies; the ‘carrot’ to the ‘stick’ of carbon tax. The government invests money in order to lessen the costs of energy from sustainable sources. The top 6 countries that subsidize renewables spend a combined total of 40 billion dollars a year. Unfortunately, we spend more than 5 trillion a year globally to subsidize fossil fuels. That’s 6.5% of the global GDP.
Subsidies can go a long way towards decreasing the financial loss Carbon Majors and consumers suffer when switching to cleaner sources of energy. By both taxing fossil fuels and subsiding renewables, governments can gradually make it so that renewables are the sounder investment. Since financial considerations are the only considerations corporations are likely to take on board, the use of both of these policies could go a long way towards reducing the footprint of Carbon Majors.
While straight-up carbon taxes are gaining popularity worldwide, there is a similar but more widely used group of policies called carbon ‘cap and trade’ schemes. These schemes involve setting a limit on how much CO2 can be produced in total then either giving or auctioning ‘credits’ to companies which equal that limit. If companies exceed their allowance, they are liable to incur very serious fines or even legal action. One way that companies can exceed their allowance is by buying (or trading) credits from other companies who are using fewer fossil fuels than they are allowed.
With a carbon tax, companies can just take the hit and produce as much CO2 as they can afford. The advantage of cap and trade schemes is that while Carbon Majors still take a huge financial hit by using fossil fuels, there is a fixed upper limit on how much they can produce. Another advantage is that companies which can reduce emissions cheaply can then sell their remaining credits to companies which are struggling to meet their allowances and make a profit. In this sense, cap and trade schemes combine the carrot and the stick into one efficient bundle.
The main criticism of cap and trade schemes is that it allows Carbon Majors to carry on polluting as they’ve always done since it is still cheaper to pay for extra credits than to switch to 100% renewable energy sources. However, smart legislation such as lowering the upper limit on carbon emissions and thus raising the price of credits at auction should be enough to make these schemes workable. The main obstacle to these amendments, as with all climate-protecting plans, is that the companies who are profiting from the destruction of the environment can use their astronomical profits to lobby for the weakening or outright removal of cap and trade schemes in the countries in which they operate.
Perhaps the main issue with putting a price on carbon is that the costs will be incurred not by major polluters but rather by the poorest people in society. When governments make it more expensive to sell fossil fuels, fossil fuel sellers make it more expensive to buy them. This kind of ‘climate austerity’ means that the plumber who needs to drive their van all day for work takes a huge financial hit while the bottom lines of the companies who sold the plumber the petrol remain despicably intact.
A possible response to this line of reasoning is that the consequences of leaving climate change unchecked will affect working class people far more severely than an increase in tax. The CEO of Exxon Mobil will not suffer from the food or water shortages brought on by climate change. Truckloads of water will be delivered to their mansion to hydrate their petunias while the working class people die of dehydration. The question becomes whether we are willing to die for our principles, deeply held as they might be.
Another consideration is that only about 10% of the emissions from carbon majors come from the extraction and transport of the fuels. The remaining 90% comes from ordinary people like you and me burning those fuels to power our cars and heat our homes. Given the catastrophic consequences of climate change, I have to say that any government action which reduces energy consumption is positive in my books. Yes, we need system change like building renewable energy infrastructure and getting rid of fossil fuel subsidies, but system change takes time. In the meantime, we must all do our best to reduce our individual consumption.
A more useful response to the problem of climate austerity is that revenue from the tax should be given as rebates to people who cannot afford to pay. Tax the carbon majors and they will raise their prices. Those who can afford to pay extra for fuel do (i.e. those above a certain income threshold) while those who cannot afford it are given rebates which could more than cover the extra cost. This would mean incurring all the benefits of carbon pricing described above without hurting the plumber who is simply trying to make a living.
It is imperative that we do everything we can to curb the power of Carbon Majors to continue their crusade against the environment. Carbon taxes and cap and trade schemes are just two ways in which we can do this and must happen in tandem with every other tactic we can think of. In an ideal world, we would simply make it illegal to extract and burn fossil fuels. Unfortunately, no government is willing to take such drastic measures against entities that in many cases have more money, and thus more power, than the governments themselves.
The CEOs of Carbon Majors are not necessarily evil people. In their eyes, the livelihoods of their many employees rests on their shoulders. What we need to convince such people is that while workers can probably find new jobs, it is very nearly too late to reverse the catastrophic effects of global warming. The question they must ask themselves is whether they would rather be responsible for a few lay-offs on one hand, or the deaths of hundreds of millions of people on the other. The fact is that those are the only options.
Every minute, the equivalent of a truckload of plastic enters the sea. Since 2004, humans have produced more plastic than we did in the previous 50 years combined. As the global population rises, our need for cheap and sturdy materials rises with it. The problem with plastics is that they are too sturdy. Every piece of plastic ever produced still exists somewhere in the world. Once the plastic has finally disintegrated, that is by no means the end of the problem. Plastics in the ocean break down into tiny particles known as microplastics. Such particles are found throughout marine ecosystems; from the stomachs of fish, to the stomachs of the seabirds who eat them.
Microplastics are not only dangerous, but also extremely difficult to clean up since they are spread out by currents all across the sea. In order to be classified as a microplastic, a piece of plastic debris must be roughly the size of your little fingernail or smaller. There are over 320 million cubic miles of water in the world’s oceans. For a sense of scale, you could fit roughly 320 million cars into a single cubic mile. Scientists have estimated that there are up to 50 trillion pieces of microplastics in the oceans. Given these figures, to say that removing microplastics from the ocean is no easy task would be the understatement of the century.
The reason that high levels of plastic in the ocean are problematic is that plastics have serious detrimental effects on the health of almost all ocean life. Over 800 species of animals have so far been shown to be negatively affected by plastic pollution. Considering that number was closer to 600 in 2012, it is safe to assume that the figure will continue to rise dramatically in the coming years. What’s more, almost 20% of the animals shown to be affected by plastic pollution are already classified as endangered due to human activity. There are two major ways in which plastics can harm or kill marine life. First, they can be ingested. When marine animals ingest plastic, the pieces can remain in their stomachs for the rest of their lives. As the amount of plastic increases, the space remaining in the stomach decreases, causing the animal to starve. In addition to this, most plastics are toxic to animal life, causing conditions like cancer and birth defects. Second, marine animals can become entangled in the plastic. If this happens at a young age, the plastic can restrict the growth of the animal, causing them to become severely deformed. This is seen most often in sea turtles. The worst offenders when it comes to entanglement are pieces of discarded fishing gear.
The phenomenon of marine life being caught by gear that has been abandoned by fishermen is known as ‘ghost fishing‘. Nets, hooks, lines, and cages continue to catch and kill fish long after the fishermen have stopped using them. Roughly 30% of all fish that are caught by humans are caught in ghost fishing gear. When you consider the sheer scale of human fishing, this percentage is astonishingly high. Leaving plastic fishing gear in the ocean, plastic or otherwise, is both short-sighted and despicable. Fishing gear is specially designed to kill as much marine life as it can. When it is under the control of a fisherman, protected marine life like whales and sea turtles can be avoided or released. Even so, fishing of any sort is devastating to endangered species. When the gear is abandoned, however, there is no targeting of species, leading to indiscriminate destruction of marine habitats.
There have been a lot of stories in the news recently about how companies like McDonald’s and Starbucks are ditching plastic straws. While this is a step in the right direction, straws only account for roughly 1% of the plastic debris in the ocean. In order to make a real difference, the companies would have to stop using plastic straws, containers, bags, cups, lids and everything else. This is a perfect example of what’s known as corporate ‘greenwashing’. If the public perception of a company is that they are trying their best to reduce the environmental damage they are causing, less people will boycott the company’s products, leading to higher revenue. Because of this, companies make the calculated decision to sacrifice a small portion of their profits in order to further their public personas as stewards of the environment. This is not to say that small steps forward like those taken by McDonald’s and the like are not helpful. Carlsberg have recently announced that they are ditching the plastic rings connecting cans in favour of glue dots. This is a positive development, since these connector rings have been shown to strangle and stunt the development of marine life and seabirds.
Plastic is not distributed evenly throughout the ocean. There are 5 major places, known as gyres, where currents have forced plastics to accumulate into huge expanses of debris. The largest of these gyres is called the great pacific garbage patch (GPGP) and contains about 2 trillion pieces of plastic. That’s 250 pieces of plastic for every human on earth in just one place. The GPGP is around the size of Texas and weighs about the same as 500 jumbo jets. The accumulation of plastic in gyres like the GPGP makes it somewhat easier to clean up oceanic plastic, but it is still a monumental challenge.
When he was just 17, Dutch aerospace engineering student Boyan Slat devised a huge U-shaped machine to clean up the GPGP that he believes could clear 50% of the plastic in just 5 years. The device uses ocean currents to move with the plastic, but since it is largely above the surface, it moves faster than the plastic, gathering it as it goes. It was deployed in the gyre in September of last year but was immediately faced with a slew of setbacks. The device was not travelling fast enough, allowing some of the plastic to escape, then a 60-foot section of the machine broke off, meaning that it had to be brought back to shore for repairs. Another issue with the device is that it cannot collect microplastics. However, it is important to gather up as many of the large pieces of plastic as we can now, since they will become microplastics in the future which will be much more difficult to clean up. We are in full damage control mode.
Despite valiant attempts to reduce our plastic consumption and remove the plastic we have already dumped in the ocean, it is highly unlikely that this problem will be solved any time soon. If anything, it will get much much worse. Humans have a history of showing up at a new location and decimating the native wildlife populations. When we first arrived in Australia, huge animals roamed the land. These included a 2-and-a-half-ton wombat, a flightless bird twice the size of an ostrich, and a predatory marsupial the size of a tiger. Within a few thousand years of humans showing up, 23 of the 24 animals that weighed over 50 kilograms had become extinct. We have spread all over the planet now, leaving only a few havens in which animals may thrive. The new frontier of animal extinction is marine life. Plastic pollution, overfishing and ghost fishing have devastated marine life and seabirds already, and the rate of destruction is only going to increase. All we can hope for is that people wake up to the genocide we are committing under the waves in time to save at least some of the majestic creatures who call the sea their home.
First Published in UCD College Tribune
Pando is the largest living thing on earth. Weighing 6,000,000 kilograms, it is about as heavy as a thousand African elephants or forty blue whales. When you enter Pando, you may hear a soothing sound like the beating of tiny wings. Pando is a grove of 47,000 quaking aspen trees, named for the distinct sound their leaves make in the wind. Every tree in the forest is genetically identical. This is because they are all parts of a single being, connected underground by a huge root system. We cannot be sure of Pando’s age, but based on its rate of expansion, coupled with a knowledge of historic climatic conditions, it could be up to 80,000 years old. If Pando is this old, it is not only the largest known organism on earth but also the oldest. In a painfully familiar twist, humans pose a serious threat to this gentle giant.
Pando’s name derives from the Latin for ‘I spread’ as Pando started life as one seed, then gradually spread itself out over an incredible 106 acres of Utah, an area equivalent to 1,700 tennis courts. Aspen spread through a process called vegetative reproduction. They send out roots underground which travel horizontally for as much as a hundred feet before sprouting into new trees. The roots then carry water and nutrients to the new sprout as needed. One reason why aspen clones like Pando can get so big is that aspen are remarkably quick to repopulate an area following a major destructive event like a forest fire. Aspen compete with conifers for light and nutrients, a competition they may well lose without the help of forest fires. Unfortunately for aspen, humans tend to put out fires wherever we can, leaving conifers to creep into the aspen’s territory. This is just one of the ways in which we are harming Pando.
For the last hundred years or so, humans have been hunting predators like wolves, bears and mountain lions in Utah and the surrounding area, leading to an increase in ungulate (hoofed mammal) populations. The main culprits are a species known as mule-deer, who eat young aspen trees before they have time to grow a thick bark with which to protect themselves. Not only does a decline in predator populations mean that fewer mule deer are being eaten, but it also means that they have become more likely to stick around and enjoy the good eating. With no predators to chase them away, the deer see no reason to move on and find a new feeding spot.
It does not help that the US forest service allows ranchers to graze their cattle on Pando for two weeks every year. Aerial photographs taken over the last fifty years show that Pando is in serious trouble. Given such data, it is extremely irresponsible for the forest service to allow any grazing at all. You may well be wondering at this point why I’m telling you all this. Pando is not like other organisms. While it is a single being, Pando is also a vast ecosystem which is home to a huge variety of animals from black bears to wild turkeys. By saving Pando, we are saving not only a biological marvel but also a forest and everything that lives within it.
A healthy aspen grove should have trees of all ages growing within it. As in a human community, it is far from ideal for the individual trees to all be the same age. If everyone in a town is over 80, there will be no youngsters to replace them when they’re gone, and the town will die with them. This is exactly what is happening to Pando’s trees. The director of the Western Aspen Alliance and Pando expert Paul Rogers has said that in many areas there are “no young or middle-aged trees at all” and that the trees that remain are “very elderly senior citizens”. Aspen trees can live anywhere from around 75-150 years old. Worryingly, the average age of trees in Pando is 130 years; if we are to save it, we are going to have to move very fast indeed.
So what can be done to save Pando? Paul Rogers recently conducted an experiment in which parts of Pando were fenced off to stop ungulates from getting in. The experiment showed very promising results, although, despite the fences being 8 feet tall, the deer were somehow able to jump over them in some places and damage the new shoots. Some have suggested that to save Pando, wolves need to be reintroduced into the ecosystem to kill the deer. The proximity of Pando to campsites and cottages makes this idea hard to sell. The evidence suggests that taller fences around larger sections of the grove and a ban on all grazing should allow new trees to flourish. Once a new generation of trees come up and live to maturity, Pando will be in a strong position to live on for years to come. However, it will also face the very real threat of global warming if we do not significantly reduce our emissions soon.
Pando’s downfall is emblematic of the large scale ecological and climatic devastation that humans have wrought on this planet. By altering certain variables, we may have sealed Pando’s fate without even knowing it was there. It is important that knock-on effects like these are understood so that we may avoid repeating the same mistakes. Pando is also a symbol of how, with a bit of elbow grease and a bit less greed, we can at least partially right many of the wrongs that we have done to the natural world. When you are responsible for a problem, it is your responsibility to fix it. We can save Pando. Maybe by joining together to preserve this one beautiful colossus, we can create a success story that can serve as a poster-child for conservation efforts around the globe.
First published in the UCD College Tribune
In November of 2018, Chinese scientist He Jiankui made an announcement that astonished the scientific community. He claims to have helped to make the first ever gene-edited babies with the use of a revolutionary technology called CRISPR. The babies, twins by the names of Lulu and Nana, were born to a father infected with HIV, the virus which causes AIDS. If Dr He’s experiment is successful, the twins will have an immunity to the virus. While this may seem at face value to be a noble goal, many believe that the risks involved outweigh the benefits.
Dr He’s experiments used a type of editing called ‘germline’ editing, meaning that any children that Lulu and Nana may have in the future will also carry this immunity. Germline editing involves making changes to reproductive cells. This means that any changes made to the individual’s genome will be passed on from generation to generation. This can be distinguished from somatic editing, in which the only person affected by the edit is the person who undergoes the procedure.
One reason why somatic editing is seen as more acceptable than germline is that people who undergo somatic editing have given informed consent prior to the procedure. While the parents of Lulu and Nana have given consent, the children themselves and any future children the twins may conceive have not consented to the potentially high risks. While HIV immunity could potentially be inherited by the descendants of these CRISPR babies, so could a myriad of unwanted and possibly even deadly side-effects.
Another concern that has been raised is that it is not clear whether Dr He’s treatment fulfilled an ‘unmet medical need’. With modern HIV treatments, someone who is carrying the virus can have the same expected lifespan as someone who is not and their chance of transmitting the virus to their children can be brought down to just 5%. Hence, geneticists worldwide have called for a moratorium on human germline trials. Critics say that gene editing technology has not yet been developed or tested sufficiently for use on human embryos. We simply do not yet know the long-term effects of genetic modification using CRISPR.
Despite a myriad of imaginable ethical hazards, CRISPR has the potential to revolutionize the biomedical sciences. CRISPR allows biologists to edit genetic information by using an enzyme called Cas9, which has the ability to cut strands of DNA. The process was pioneered in bacteria as a defence mechanism against viruses. Geneticists use CRISPR to target specific areas of genetic code and cut it in a specified region. Cutting a strand of DNA in the right place can cause a certain gene to be disabled, activated or replaced by one introduced by scientists. The possible applications of CRISPR range from curing cancer to eliminating malaria from mosquitos. One team at Harvard led by Prof. George Church even famously claimed that they will be able to ostensibly resurrect the woolly mammoth in the next year or two using the technology.
Some scientists, including mammoth-man George Church, have come out in defence of He. While Church had reservations regarding He’s level of transparency, he suggested that enough studies had been carried out that maybe it was the right time to end the moratorium anyway. While he accepted the risk of off-target mutations, he said that the risk ‘may never be zero’ and that Dr He had done enough to minimise it. This contradicts the views of most scientists and institutions, including a statement released by Francis Collins, the director of the National Institutes of Health. Collins denounced He’s work, saying, among other things, that ‘the possibility of damaging off-target effects has not been satisfactorily explored’.
Genes are extremely complex things. Locating a single gene and modifying it requires an extraordinary level of precision and even when it is successfully targeted it is impossible to fully predict the consequences. Though we have been studying certain genes for a very long time, we still do not know what the indirect effects of certain edits may be as no long-term studies of how edits affect the human body have been carried out as of yet. Such unintended effects are known as ‘off-target mutations’.
The final concern is perhaps the most serious. While CRISPR may in the future be used to treat some forms of cancer, it is possible that premature germline editing like the kind He carried out may actually increase the risk of cancer in people like Lulu, Nana and their descendants. Two recent studies have raised concerns about an off-target effect that CRISPR may have on a gene for a protein known as the ‘guardian of the genome’: p53. This protein is responsible for repairing or destroying damaged DNA. A mutated or ineffective p53 gene has been shown to be responsible for nearly half of all ovarian cancers and a significant portion of many other types of cancer too. CRISPR interventions activate p53, since DNA has been cut and must be either repaired or destroyed and p53 undoes the work CRISPR has done. The worry is that this could result in a kind of artificial selection on the cellular level, as CRISPR is more successful in cells with ineffective copies of the p53 gene, which are more at risk of becoming cancer cells. So far, only certain forms of cells have shown evidence of raising the risk of cancer when modified using CRISPR and no company is attempting clinical trials using CRISPR on these cells. Some scientists have called the recent studies concerning p53 a ‘cautionary tale’ since they may affect future CRISPR trials that are yet to begin.
CRISPR is an incredible technology that will surely be responsible for many breakthroughs in biological and medical science. It may someday give us powers that we cannot even conceive of today. However, that time has not yet come. It is imperative that we do not jump the gun. Dangerous, premature experiments like Dr He’s harm the public perception of gene editing and, in turn, harm the funding available for important research. While we should not give up on gene editing, we should also not use it to play with human lives until we know more about the benefits and the risks.
In the wake of recent studies showing how dangerously close to the brink we are when it comes to climate change, it is more important now than ever to seriously consider every possible alternative to environmentally damaging fossil fuels. One such alternative comes in the form of biofuels. Humans have been using biofuels for as long as we’ve been using wood to fuel our fires. In the last hundred or so years, however, we’ve begun to understand how plant matter can be converted into liquid fuels that could soon power a plane. In this piece, I’ll be looking at where biofuels are now and where they need to be if they are to significantly reduce CO2 emissions. I’ll be concentrating my efforts on recent attempts by the scientific community to make grass a viable fuel for transportation.
Grass is the most abundant plant on the planet. In my home country of Ireland, more than two thirds of all land is covered in naturally growing grass. If we could refine and perfect the process of turning grasses into fuel (grassoline), this could be a real contribution towards slowing the march of climate change. The problem right now is that it is expensive and inefficient. Many scientists in the field, however, think that given time and money, we could tap into this huge source of unharnessed power and perhaps help to save the planet in the process.
The reason grass in particular is being considered as a biofuel is not because it is necessarily the most efficient plant to use, but rather because of its abundance and willingness to grow in fields that are inhospitable to food crops, known as marginal lands. Another reason that grass is attractive as a biofuel is that it is not really needed for anything else. Other candidates for biofuels (like wood, sugarcane and soybeans) have the disadvantage of being useful for things like furniture, rum and tofu.
But why aviation fuel? One reason is that while cars are slowly turning electric, it is unlikely that planes will follow suit any time soon. This means that in the near future, cars could be powered by renewable sources whereas planes will continue to require liquid fuel. The other more pressing reason is that travelling by plane is far worse for the environment than any other mode of transport. This is down to two factors; first, planes are less efficient than other modes of transport in terms of emissions per passenger mile. Second, planes allow us to travel a far greater number of miles than we would otherwise be able to travel. The carbon footprint of flying from London to Hong Kong and back again is about a quarter of the average UK person’s annual carbon footprint.
The idea that we could use grass, algae and other plants to produce aviation fuel is not nearly as crazy as it sounds. The fossil fuels which we currently use are themselves made of organic matter that has, over a very long time, undergone a natural process called pyrolysis. Human beings have been using the process of pyrolysis for our own gain for thousands of years in the form of charcoal burning. Pyrolysis involves separating materials into their constituent molecules in the absence of oxygen. This means, very roughly, heating up the material to a specified temperature, covering it, and allowing it to separate into liquid, solid and gas. These products can then be refined into fuels. Recently, it has been found that microwave heating produces a higher pyrolysis yield than traditional methods since it can be done entirely in the absence of oxygen and at a very precise temperature. Another benefit is that the characteristic ‘hot spots’ of microwave heating aid in pyrolysis.
You might be thinking that grass is an important source of food for livestock. The beauty of using grass as a biofuel is that this resource would not be lost. The solid by-product of grass pyrolysis can still be fed to livestock. What’s more, by removing the liquid constituents, the feed can be preserved much longer than fresh grass cuttings. In the UK, biofuels already account for nearly 3% of all road and non-road mobile machinery fuel, but with the predicted change in efficiency given a few years, they could eventually account for a lot more than that.
Right now, scientists can only produce a few drops of biofuel from grass in the laboratory. Tests carried out at Ghent University in Belgium show, however, that there is a potentially very efficient energy source in grass if we can learn to harness it correctly. In April 2017, the researchers at Ghent found that a certain type of bacteria (clostridium) can be used to metabolize certain grasses into decane, a key ingredient in both petrol and aviation fuel. While this breakthrough cannot yet be used effectively, it is key knowledge that will inform future research into better biofuel technologies.
Hang on, you might say, if refining plant matter gives us the same fuel as we are already using, then why is it better for the environment? Surely biofuels release the same amount of CO2 as fossil fuels? This is indeed true. The difference is that the CO2 in living plants has only recently been absorbed from the air by the plant and is simply being released again. As the grass grows, it sequesters CO2 from the air. When it burns, that recently absorbed CO2 returns to the atmosphere to be trapped by the next batch of grassoline. Because of this, biofuels are said to be ‘carbon neutral’. With fossil fuels, the CO2 has been absent from the environment for a very long time, trapped underground. By burning it, we are releasing extra CO2 rather than what was already there.
A major obstacle to biofuel efficiency growth is that governments and companies are not willing to invest heavily in something that may not yield solid results for years to come. This is simply short-sightedness. The science will continue to improve. Lack of investment only slows down the process. The people who invest heavily now will surely see a huge return in a matter of years. Another well-known obstacle in the way of all renewable energies is the huge sums of money tied up in the fossil fuel industry. The industry is worth about 7 trillion USD globally. No wonder, then, that lobby groups are able so easily to sway policy-makers.
Biofuels are controversial among environmentalists, since they come with a number of downsides. Perhaps the most worrying is that every square foot of land which is used to produce the fuel is land that could instead be used to nurture biodiversity. Species are currently being lost so quickly as to constitute the sixth mass extinction in earth’s history. For me, using food crops like corn as feedstock is entirely off the table, since it opens the door to a future in which rich elites use corn-fed biofuel to fly away on their holidays while depriving poor people of food which is vital to their survival.
Another drawback is that biofuels are not very efficient when it comes to land use. According to Mike Berners-Lee, using solar panels instead to generate the power for flying would require 270 times less land than growing wheat for biofuel. The problem, however, is building a good enough battery. Right now, 1 kilo of jet fuel carries about the same energy as 20 kilos of premium lithion-ion batteries. One ray of hope came in March of 2015; ‘Solar Impulse 2’ began its attempt to become the first entirely solar powered plane to fly around the world. The journey was arduous and long for the two pilots. One of the pilots was named Bertrand Picard, a Swiss medical doctor who who was already the first person to fly around the world non-stop in a hot air balloon. Captain Picard of the USS Solar Impulse finally landed the plane in Abu Dhabi on July 26th 2016, from the spot where it had departed 505 days earlier.
Regardless of what figures like the US president may say, climate change is a very real and very serious danger. Biofuels are just one example of the many ways in which we can combat this danger, but they are one which will continue to grow in importance for years to come. The question is whether our money would be better spent developing renewable energies like solar and wind which require far less land and are thus better for wildlife conservation. When it comes to planes, however, grassoline may help to ease the transition to a low-carbon world. Every little helps in the fight against the huge and menacing entity that is climate change.