US report contradicts Trump team: Warming mostly man-made

This Nov. 10, 2016 aerial photo released by NASA, shows a rift in the Antarctic Peninsula's Larsen C ice shelf. A vast iceberg with twice the volume of Lake Erie has broken off from a key floating ice shelf in Antarctica, scientists said Wednesday July 12, 2017 . The iceberg broke off from the Larsen C ice shelf, scientists at the University of Swansea in Britain said. The iceberg, which is likely to be named A68, is described as weighing 1 trillion tons (1.12 trillion U.S. tons).(John Sonntag/NASA via AP)

WASHINGTON (AP) — A massive U.S. report concludes the evidence of global warming is stronger than ever and that more than 90 percent of it has been caused by humans.

The conclusion contradicts a favorite talking point of senior members of the Trump administration.

A 477-page report released Friday said it’s “extremely likely” — meaning with 95 to 100 percent certainty — that global warming is man-made, mostly from carbon dioxide through the burning of coal, oil and natural gas.

Energy Secretary Rick Perry and Environmental Protection Agency chief Scott Pruitt have said carbon dioxide isn’t the primary contributor to global warming.

Since 1900, the report says Earth has warmed by 1.8 degrees (1 degree Celsius) and seas have risen by 8 inches. Heat waves, downpours and wildfires have become frequent.

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