FORTUNE: The world’s richest man says he’ll spend $1 billion to fight global warming and has persuaded other billionaires to join him. Here’s how he can get the most bang for his buck: On Monday, just in time for the start of the Paris climate talks, Bill Gates and other wealthy entrepreneurs announced the creation of the Breakthrough Energy Coalition, a global group of private investors committed to “early-stage investing in potentially transformative energy systems” with “near zero carbon emissions.” The coalition includes those with experience in clean energy investment, including Virgin’s Richard Branson, and venture capitalists John Doerr, and Vinod Khosla. But it also brings into the f
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