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Jellyfish invasion a sign of trouble to come

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World leaders who attended the U.N. climate conference in Copenhagen probably didn't discuss the invasion of the jellyfish, but perhaps they should have. While it might sound like the stuff of a B horror movie, millions of jellyfish--some the size of refrigerators--are swarming coastlines from Spain to New York and Japan to Hawaii. Last month, these marauders sank a 10-ton fishing trawler off the coast of Japan after the boat's crew tried to haul in a net containing dozens of huge Nomura jellyfish--giants who can weigh up to 450 pounds each.

The best way to fight this growing menace is with our forks.

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Scientists believe that a combination of climate change, pollution and overfishing is causing the boom in jellyfish populations. Leaving animals, including fish, off our dinner plates will combat all three problems.

Unless you've been living under a rock--or perhaps in a McDonald's--you probably know that raising animals for food is not doing the planet any favors. Today's meat factories spew greenhouse gasses, gobble up precious resources, contaminate the air and pollute the water. According to a U.N. report, the meat industry generates 40 percent more greenhouse gasses than all the cars, trucks, SUVs, ships and planes in the world combined. Hello, jellies: Almost all jellyfish breed better and faster in warmer waters.

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Animal factories are also among the causes of ocean "dead zones," as excrement from factory farms makes its way to streams and rivers and, ultimately, to the open seas, resulting in toxic algae blooms. While other sea animals die off in dead zones--hence the name--jellyfish not only survive but also thrive.

The commercial fishing industry must also share the blame for the jelly boom.

The U.N.'s Food and Agriculture Organization reports that 80 percent of the world's fisheries are now either over-exploited, fully exploited, significantly depleted or recovering from over-exploitation. That's not surprising: Indiscriminate fishing practices, such as the use of miles-long nets and longlines with thousands of individually baited hooks, are stripping the oceans clean of sea life. And fish farms make the devastation of our oceans even worse, as many farmed fish are fed ocean-caught fish. It takes about 3 pounds of ocean-caught fish to produce just 1 pound of farmed fish.

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A study published in the journal Nature found that the number of large predatory fish--such as tuna and swordfish--has declined by 90 percent. These are the same fish who help keep jellyfish populations in check. In the Mediterranean, overfishing of both large and small fish has left jellyfish with few predators and little competition for food.

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