The Brazilian province of Amazonas has declared a state of emergency to contend with what appears to be the severest drought in the Amazon in recorded history. The drought has worldwide implications as the Amazon River makes up nearly twenty percent of the freshwater on the Earth's surface. Scientists aren't completely sure why this is happening, but the effects of the drought are both undeniable and far-reaching. Host Steve Curwood talks with Dr. Dan Nepstad, a senior scientist from the Woods Hole Research Institute who's based in the Amazon.