Reuters: A 2005 drought in the Amazon rainforest killed trees and released more greenhouse gas than the annual emissions of Europe and Japan, an international study showed on Thursday. The report said rainforests from Africa to Latin America may speed up global warming if the climate becomes drier this century. Plants soak up heat-trapping carbon dioxide as they grow and release it when they die and rot. “The Amazon forest was surprisingly sensitive to drought,” said Oliver Phillips, a …