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It's 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 storms—and succeeded in stabilizing the Earth's climate. Greenhouse gas concentrations are peaking and are expected to drift downward in the 22nd century. The rise in global temperatures is slowing and 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. This scenario of an imagined future raises a key question: What must we do in the 21st century to make such a future possible, and to head off the kind of climate catastrophe that many scientists now see as likely? This question inspires the theme of the Worldwatch Institute's State of the World 2009 report: how climate change will play out over the coming century, and what steps we most urgently need to take now.

Climate change threatens all people, but its adverse effects will be felt most acutely by the world's poor. Absent urgent action, new threats to food security, public health, and other societal needs may reverse hard-fought human development gains. Climate Change and Global Poverty makes concrete recommendations to integrate international development and climate protection strategies. It demonstrates that effective climate solutions must empower global development, while poverty alleviation itself must become a central strategy for both mitigating emissions and reducing global vulnerability to adverse climate impacts.

This meticulously documented call-to-action reveals extensive scientific evidence that the global warming crisis is far worse than officially indicated — and that we're almost at the point of no return. Serious climate-change impacts are already happening: large ice-sheets are disintegrating, sea-level rises will reach 5 metres this century, and we are seeing devastating species loss. It is no longer a case of how much more we can ‘safely'emit, but whether we can stop emissions and produce a deliberate cooling before the Earth's climate system reaches a point beyond any hope of human restoration. These imperatives are incompatible with ‘politics as usual'and ‘business as usual'— we face a sustainability emergency that urgently requires a clear break from the politics of failure-inducing compromise.