Florida’s Gulf Coast is battling the worst red tide in more than 10 years, pushing Gov. Rick Scott to declare a state of emergency this week. But all over the world, red tides that grow out of control, kill fish, and take all of the oxygen from coastal waters are lasting longer and longer.

Scientists say Florida’s latest red tide actually began in November 2017 is now covering more than 150 miles from Anna Maria Island to Naples Florida. The red tide originated in the Gulf of Mexico between 10 and 40 miles offshore and was then transported by wind and currents.

Since then, it’s been killing off marine life and posing a toxic threat to humans as well. Here’s what you need to know.

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