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Humans are driving climate change, federal scientists say

New U.S. report tallies impacts from hottest-ever years to extreme weather threats

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6:19pm, November 3, 2017
Jakobshavn Glacier in western Greenland

RETREATING ICE  Jakobshavn Glacier in western Greenland (its front edge, where ice is calving into the ocean, shown here in 2012) is one of the world’s fastest-shrinking glaciers. A new U.S. report increases projections of average global sea level rise due to accelerating ice sheet melting if greenhouse gas emissions continue unabated.

It is “extremely likely” that humans are driving warming on Earth since the 1950s. That statement — which indicates a 95 to 100 percent confidence in the finding — came in a report released November 3 by the U.S. Global Change Research Program. This interagency effort was established in 1989 by presidential initiative to help inform national science policy.

The 2017 Climate Science Special Report, which lays out the current state of scientific knowledge on climate change, will be rolled into the fourth National Climate Assessment, set to be released in late 2018.

The last national climate assessment, released in 2014, also concluded that recent

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