Warming drives spread of toxic algae in US, researchers say

In this June 12, 2018, file photo, a potentially toxic blue-green algae bloom in Provo Bay in Provo, Utah. 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. (Rick Egan/The Salt Lake Tribune via AP, File)

SALEM, Ore. — The words blasted to cellphones around Oregon’s capital city were ominous: “Civil emergency . prepare for action.”

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