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"Every year, we are dangerously warping the climate by putting gigantic amounts of carbon dioxide into the air. But CO2 isn't merely the by-product of burning fossil fuels--it is also fundamental to how our planet works. All life is ultimately made from CO2, and it has kept Earth bizarrely habitable for hundreds of millions of years. In short, it is the most important substance on Earth. But how is it that CO2 is as essential to life on Earth as it...