chapter
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About This Book

It is New Year’s Day, 2101. Somehow, humanity survived the worst of global warming-the higher temperatures and sea levels and the more intense droughts and stormsand succeeded in stabilizing Earth’s climate. Atmospheric greenhouse gas concentrations peaked a few decades ago and are expected to continue their downward drift throughout the twenty-second century. Global temperatures are slowly returning to their pre-warming levels. The natural world is gradually healing. The social contract largely held. And humanity as a whole is better fed, healthier, and more prosperous today than it was a century ago. What did humanity do in the twenty-first century-and especially in 2009 and the years immediately following-to snatch a threatened world from the jaws of climate change catastrophe?