LiveScience: This is the third year the agency has forecast the amount of toxic slime that would choke Lake Erie during the late summer. The forecast is based on models of fertilizer runoff and satellite tracking of precipitation and snowmelt. The noxious blooms occur when fertilizer runoff feeds the runaway growth of cyanobacteria, or blue-green algae. The algae are harmful to marine life and to humans. Decaying cyanobacteria suck up oxygen, creating dead zones. Some kinds of algae also emit toxins that damage...