Newsweek: Global warming has dramatically increased the likelihood of the type of torrential rainfall that flooded Louisiana last month, according to a new study by government and private sector scientists. Researchers working with the National Oceanic and Atmospheric Administration found that the probability of such storms along the Gulf Coast had increased by at least 40 percent since 1900and may even have doubledthanks to climate change. In August, cities and towns in the southern part of Louisiana were...