Coozer Prophesy: Jellyfish invasion closing beaches.

This is a lot more serious than people think. Don't say we didn't warn you...

As the summer comes to an end a disturbing sign of environmental imbalance is washing up on many of the world's beaches: a jellyfish invasion.

Swarms of small, not entirely friendly creatures, are forcing beach closings from the Mediterranean to Australia.

[...] Scientists say it is a sign that the health of the oceans is deteriorating and warn that mass extinctions of marine life could be coming.

"It's kind of a canary in a coal mine as to what might be coming next. Are the oceans going to be getting much worse?" Madin asked.

Marine biologists say there are several possible reasons for the ocean's decline. As global warming raises the water's temperature jellyfish breed faster. And they have fewer predators thanks to the fishermen who catch tuna and swordfish. Pollution also plays a role in upsetting the delicate balance of the ocean's ecosystem.