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In November 2015, world leaders descended on Paris to negotiate a historic agreement to limit global warming. But on the summit’s opening day, attention turned to a private citizen slouched awkwardly in a chair on stage: Bill Gates.
Gates, with his characteristic flop of sandy hair, grinned impishly as President Barack Obama called him a “visionary” and a “driving force” behind a pair of pledges that both saw as key to the larger agreement. First the world’s largest economies would double their spending on research into clean-energy technologies. Then investors like Gates would back the startups that emerged. The Microsoft cofounder had already enlisted two dozen other billionaires to join the effort.
