CaptionA riverboat stranded east of Manaus. The Amazon region experienced its worst drought in many decades. Low water levels stranded river-life and boats. Those communities who relied on river transport were isolated and had to depend on airlifts for supplies. Greenpeace blamed the drought on global warming and deforestation, claiming that forest burning had raised temperatures and prevented cloud formation. Brazilian government meteorologists said the dry weather had been caused by unusually high temperatures in the Atlantic Ocean and also linked it to the year's devastating hurricanes.