'Code red': UN scientists warn of worsening global warming

Earth is getting so hot that temperatures in about a decade will probably blow past a level of warming that world leaders have sought to prevent, according to a report released Monday that the United Nations called a "code ...

Time running out to save coral reefs

New research on the growth rates of coral reefs shows there is still a window of opportunity to save the world's coral reefs—but time is running out.

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