Richard Muller's conversion is complete. The University of California, Berkeley, physicist once doubted the existence of climate change. Now he is convinced it's not only real but man-made, based on the latest results from his controversial review of temperature records. Go to story #1

A crop-searing drought grips the Midwest and Southeast. In the Rocky Mountains, extraordinary "superfires" rip through thousands of acres of high-elevation pine. The Mississippi River runs so low that barge traffic must be slowed, at times suspended. Across the country, roads buckle under the heat. The year is 1988, and for the first time, a majority of Americans are waking up to a disconcerting phenomenon known as the greenhouse effect. Go to story #2