Bloomberg: Warmer Atlantic waters spawned more severe storms in the Caribbean in 2005, including Hurricane Katrina, and had an unexpected impact on the world’s largest tropical rain forest: drought. The milder waters in the second-biggest ocean caused such arid conditions in the western and southern parts of the Amazon that younger trees died and growth in older ones slowed. That then turned a rain forest that normally absorbs 500 million tons of carbon dioxide a year into a net emitter of the …