Water Algae Blooms

FILE - In this May 29, 2018, file photo, supermarket shelves are stripped bare of bottled water in Salem, Ore., after officials warned residents that tap water was unsafe for children and the elderly due to an algae bloom. Researchers and officials across the country say increasingly frequent toxic algae blooms are another bi-product of global warming. They point to looming questions about their effects on human health. (AP Photo/Tom James, File)