Over the next few decades we are facing the possibility, indeed the probability, of global catastrophe on a level unprecedented in human history. The message of science is clear. As James Hansen, the foremost climate scientist in the United States, has warned, this may be "our last chance to save humanity." In order to understand the full nature of this threat and how it needs to be addressed, it is essential to get a historical perspective on how we got where we are, and how this is related to the current socioeconomic system, namely capitalism.
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