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These mosquitoes will never spread malaria.
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But just changing genetic information is not enough.
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The edits would only be inherited by half the offspring, because most genes have two versions inside the genome as a fail-safe.
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So, after just two generations, at most only half of the offspring would carry the engineered gene.
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In a population of billions of mosquitoes, they would hardly make a difference.
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A genetic engineering method called the gene drive solves this problem.
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It forces the new gene to become dominant in the following generations, overpowering the old gene almost completely.
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Thanks to this twist, 99.5% of all the engineered mosquitoes' offspring will carry the anti-malaria edit.
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If we were to release enough engineered mosquitoes into the wild to mate with normal mosquitoes, the malaria-blocking genes would spread extremely quickly.
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As the new gene becomes a permanent feature of the mosquito population, plasmodium would lose its home base.
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Scientists hoped that the change would be so fast that they could not adapt to it quickly enough.
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Malaria could virtually disappear.
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If you take into account that nearly half a million children are killed by it every year, about five have died since this video started.
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Some scientists argue that we should use the technology sooner rather than later.
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The mosquitoes themselves would probably only profit from this.
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They don't have anything to gain from carrying parasites.
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And this might only be the first step.
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Malaria might just be the beginning.
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Different mosquitoes also carry dengue fever and Zika.
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Ticks transmit Lyme disease.
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Flies transmit sleeping sickness.
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Fleas transmit the plague.
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We could save millions of lives and prevent suffering on an unbelievable scale.
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So, why haven't we done this yet?
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For one, CRISPR editing is barely four years old, so until very recently, we just couldn't do it as fast and easily.
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And there are valid concerns.
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Never before have humans consciously changed the genetic code of a free living organism on this scale.
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Once we do it, there is no going back.
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So it has to be done right, because there could be unwanted consequences if we set out to edit nature.
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In the specific case of malaria, though, the risk might be acceptable, since the genetic modification doesn't make a big change in the overall genome.
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It only changes a very specific part.
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The worst case scenario here is probably that it might not work or that the parasite adapts in a negative way.
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There is still much debate.
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Technology as powerful as gene drive needs to be handled with a lot of care.
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But at some point, we have to ask ourselves, is it unethical to not use this technology when every day, 1,000 children die?
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Humanity has to decide how to act on this in the next few years.
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The public discussion is way behind the technology in this case.
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What do you think?
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By the end of the 21st century, humanity is becoming desperate.
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Decades of heat waves and droughts have led to unusually poor harvests, while the warming oceans yield fewer fish each year.
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In the tropical zones, millions suffer from famines, and resource wars have made millions more flee to the north.
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As things quickly get worse, in an act of desperation, the world's governments decide to enact an emergency plan.
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It's far from certain that a grim scenario like this will play out, but the failure of world leaders to effectively address climate change makes it far from impossible.
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So, in the near future, it might become necessary to try something radical to slow down rapid climate change.
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What is geoengineering? Is it really an option? And what if it goes wrong?
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Geoengineering methods vary from fantastic ones, like constructing giant light sails in space, to seeding clouds with salt,
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In this video, we'll focus on an intervention we could see during our lifetimes.
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CO2 doesn't heat up the planet on its own.
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Almost all of the energy on Earth comes from the sun in the form of electromagnetic radiation.
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About 71% of this energy is absorbed by the Earth's surface and atmosphere.
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This absorbed energy is emitted again as infrared radiation.
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And CO2 is able to trap this infrared radiation and keep it in the atmosphere for a while.
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You can compare this effect with snuggling under a blanket in the morning.
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Even in a really cold room, your body emits infrared radiation, and the air between your body and the blanket traps it and creates a warm and comfy feeling.
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So one way to cool down the planet would be to prevent energy from getting trapped under our planet blanket.
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About 29% of the solar radiation hitting Earth is reflected back to space by bright surfaces like ice, deserts, snow, or clouds.
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We can look at nature for inspiration.
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Aside from massive devastation and almost 900 dead, scientists noted its strong impact on the global climate.
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The explosion ejected millions of tons of particles and gas as high as the stratosphere, which hung around there for a while.
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The stuff that's interesting for geoengineering is sulfur dioxide, a nasty smelling and invisible gas.
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High in the atmosphere, it produced a haze of sulfuric acid droplets that mixed with water and created giant veils.
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These veils reduced the sunlight reaching Earth's surface by roughly 1%.
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Global average temperatures dropped by 0.5°C.
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It took three years until this cooling effect had stopped.
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Humans could imitate this process by injecting sulfur particles directly into the stratosphere.
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According to some scientists, this might be surprisingly easy to do, and we don't even need a lot of new technology for it.
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According to one study, it also might be pretty cheap compared with the costs of rapid climate change.
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A small fleet of specialized aircraft could ascend once a year and distribute aerosols along the equator from where they would be spread around the world.
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Projections assumed that injecting between 5 and 8 megatons of material per year would reflect enough sunlight to slow down or even stop global warming,
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Unfortunately, there might be a few unhappy side effects.
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There are a number of potential issues with aerosol injections.
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Rainfall patterns could change, which could negatively affect agriculture and cause famine.
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Billions of people could be affected in the worst case.
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Also, after the 1991 Mount Pinatubo eruption, the acid water veils not only cooled down the surface, they also heated up the stratosphere.
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As it turns out, acid is bad for the ozone layer, and the ozone hole over Antarctica was the largest it has ever been.
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Injecting sulfur particles over decades could have a similar effect.
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Scientists have already suggested using a combination of different minerals that might have much less harmful effects on the ozone layer,
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but more research and experiments need to be done to make sure this could work.
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But even if we don't damage the ozone layer, there are other risks.
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Politicians and industry might use the cooling effect as an excuse to delay the switch to a carbon neutral economy.
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Even if geoengineering slows down global warming, humanity is still adding extra CO2 to the atmosphere.
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More CO2 in the air means that the oceans absorb more CO2, which makes them more acidic.
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This is already beginning to be deadly to huge ecosystems like coral reefs, and the longer this continues, the more severe the effects will be.
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But it gets worse.
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Once we start pumping particles into the atmosphere on a massive scale, we might be forced to do so for a long time, or we could risk a termination shock.
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What that means is that if humanity continues to enrich the atmosphere with CO2,
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but at the same time prevents the planet from heating up by blocking solar radiation, we're sitting on a time bomb.
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Once we stop geoengineering, the natural cycle will take over again, and Earth would heat up.
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But after a few decades of keeping the planet artificially cold, while still releasing massive amounts of CO2, it would heat up much, much quicker.
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An increase in temperature that would take 50 years today could happen in just 10 years.
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Such a temperature shock in such a short time would disrupt every major system on Earth so much that it would be impossible to adapt in time.
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The worst case scenario could be dramatic famines and the rapid destruction of ecosystems.
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Humanity might survive, but the survivors would inhabit an unfamiliar and hostile world.
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The best case scenario is that once the world has finally fully understood the existential danger of rapid climate change, geoengineering can buy us a crucial decade or two.
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Geoengineering is a scary concept.
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It's not a solution to climate change, and it might even be a welcome excuse for the fossil fuel industry to delay the end of the fossil fuel age.
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Over the last few decades, geoengineering has been so controversial that it's stopped many scientists from doing the experiments necessary to understand it better.
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But blankly opposing geoengineering is short-sighted.
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The sad truth is we are already running a geoengineering experiment.
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We're testing how fast the world changes if we add about 40 billion tons of CO2 each year.
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