Once and Future Climate Change

[Changing Climates Special Issue Index][1] ![Figure][2] Wet to dry. Kenya's Lake Magadi, now alkaline and mostly dry, once teemed with freshwater fish; a core drilled here will reveal ancient climate swings. CREDIT: © STEVE BLOOM IMAGES/ALAMY Anthropogenic climate change is now a part of our reality. Even the most optimistic estimates of the effects of contemporary fossil fuel use suggest that mean global temperature will rise by a minimum...