Climate-change experts are researching ways to cool down the planet using geoengineering. How could spraying chemicals into the stratosphere help counteract global warming? Click here to subscribe to The Economist on YouTube: What if you discovered a way to cool down the planet? Extreme weather events are becoming more common and more ferocious. As the surface temperature of earth continues to rise, so too will the ferocity of natural disasters. In 2018 scientists will take b
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