Even if carbon emissions were dramatically reduced all over the planet (including in China, India, and Africa, where fossil fuel engines are just firing up), the biosphere is already facing catastrophe. The greenhouse effect is self-compounding, and scientists tell us that atmospheric temperatures will continue to rise even without more pollution. However difficult it has been to launch a real discussion of the causes of global warming, an even larger controversy looms now, as problematic attempts to mitigate warming through “geoengineering” are forced onto the human agenda.
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