Top StoryNPS Climate Change Respo/Flickr/Commercial use & mods allowed A toxic time bomb is ticking in the Arctic Thousands of contaminated sites are sitting on permafrost that'll soon thaw, a looming disaster that could spread beyond the region.
Impactscommons.wikimedia.org Failure to slow warming will set off climate 'tipping points,'' scientists say As global warming passes certain limits, dire changes will probably become irreversible, the researchers said, including the loss of polar ice sheets and the death of coral reefs.
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