CNN: Extreme natural events, not man-made climate change, led to last summer's historic drought in the Great Plains, a new federal study said Friday. Drought occurred in six Plains states between last May and August because moist Gulf of Mexico air "failed to stream northward in late spring," and summer storms were few and stingy with rainfall, said a report by the National Oceanic and Atmospheric Administration. "Neither ocean states nor human-induced climate change, factors that can provide long-lead...