The research, to be published in the March issue of the journal Quaternary Science Reviews, represents an ambitious attempt to show that, through a series of events, human activity was affecting the climate long before the industrial revolution and global warming

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Global health authorities on Tuesday declared the Americas free of endemic measles, the first region to be so certified. The hemisphere’s last case of endemic measles — meaning one that did not spring from an imported strain — was in 2002

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