In this Oct. 4, 2005 file photo, a boat tries to make its way through a section of the Amazon River suffering from low water levels in northern Brazil. In 2005, the Amazon dropped by several feet because of drought, halting travel and harming the important fishing industry. In 2009, communities along the river are adding new floors to their stilt houses, trying to stay above rising floodwaters that have killed 44 people and left 376,000 homeless.