Reuters: Most coral reefs in the Caribbean could vanish in the next two decades, hit by the loss of fish and sea urchins that eat a slime of coral-smothering algae, a U.N.-backed study said on Wednesday. The review, the most comprehensive to date of Caribbean reefs that are vital tourist attractions for many island nations, said climate change had played only a minor role in the reefs' demise, despite past speculation it was a main cause. "With only about one-sixth of the original coral cover left, most...