Our civilization’s central organizing project is to transform our adverse impact on the climate system. Scientists tell us that we must act now to mitigate the most severe effects of climate change; that we have a very small window before we reach an irreversible tipping point, after which the planet will become inhospitable for human life. According to Jim Hansen, NASA’s chief climate scientist, "we have at most 10 years to fundamentally alter the trajectory of global greenhouse gas emissions and take significant actions to reduce them” in order to avoid "disastrous effects.”
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