Résultats pour "James Lawrence Powell" dans Sciences sociales et politiques

Around 13,000 years ago, three things happened at once: (1) Global temperature suddenly stopped rising and plunged back to ice age-frigidity. (2) The Western Hemisphere’s largest mammals, including the horse, camel, woolly mammoth, saber-toothed cat, and dozens more, went extinct. And (3) the uniquely beautiful stonework of the early American Clovis people disappeared from the archeological record. For the past half-century, scientists have struggled to explain the three events. Were they independent of each other, or could they have had a common cause?

For the last few years, and especially in 2011, a new extreme weather event seems to pop up each week. Some decide to stick around: Texas and Oklahoma have been suffering from historic droughts for six months, with no sign of relief. No sooner does Hurricane Irene disappear than Tropical Storm Lee appears to flood Louisiana and stir up wildfires in nearby Texas. We seem beset by more, and more extreme, heatwaves, droughts, wildfires, torrential rainstorms, tornadoes, hurricanes, and blizzards than any of us can remember.