What’s killing coral in the Florida Keys? Scientists say it’s more than just rising temperatures
02:16
Coral reefs near the Florida Keys are being destroyed, with scientists reporting a “heartbreaking” decline over the past three decades. NBC’s Kerry Sanders meets with researchers who say warming water temperatures are just one part of the problem. Nitrogen from fossil fuels, wastewater and agricultural runoff is also threatening the fragile underwater ecosystem.Sept. 21, 2019
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