ZEPHYRHILLS, Fla. (AP) — Seen from the air, a Florida freshwater spring is a bit of liquid heaven, luring humans and wildlife to enjoy its aquamarine cool. With at least 1,000 of them — more than any other state — the springs serve as beaches for large swaths of central and northwestern Florida far from the ocean, with teenagers backflipping from docks and snorkelers peering into the crystalline depths.

But these treasures are under threat from agricultural pollution, and .

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