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10 places to visit before they vanish

By: Bryan Nelson on Dec. 29, 2009, 11:49 a.m.
Snorklers hold the sign at the Great Barrier Reef

Photo: brewbooks/Flickr

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Great Barrier Reef

It's so large that it can be seen from space, but the Great Barrier Reef is disappearing at an increased rate because of climate change. Rising ocean temperatures, water pollution, ocean acidification and cyclones continually pummel the reef and have caused mass coral bleaching. What took 8,000 years for nature to create could disappear within our lifetimes.