Sailboats sit on the dry and cracked lake bed at Benbrook Lake in Benbrook, Texas Aug. 16 during extreme drought conditions throughout the state. Nature is pummeling the United States in 2011 with extremes. There have been more than 700 U.S. disaster and weather deaths. What's happening, say experts, is mostly random chance or the bad luck of getting the wrong roll of the dice. However, there is something more to it, many of them say. Man-made global warming is loading the dice to increase our odds of getting the bad roll.