In this new edition of his authoritative book, MIT atmospheric scientist Kerry Emanuel--a political conservative--outlines the basic science of global warming and how the current consensus has emerged. He also covers two major developments that have occurred since the first edition: the most recent round of updated projections from the Intergovernmental Panel on Climate Change climate simulations, and the so-called climategate incident that heralded the subsequent collapse of popular and political support in the United States for dealing with climate change.