Washington Post: THE DOMINANT ANIMAL Human Evolution and the Environment By Paul R. Ehrlich and Anne H. Ehrlich Island Press/Shearwater. 428 pp. $35 Canadians joke that, given their vile winters, they are the only people in the world who welcome global warming. But some things are too serious for humor. The world is in a crisis because of rising temperatures. Climate patterns have been disrupted, with devastating effects on lands near and far. Regions that once produced food in …