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Broad U.S. report says global warming is massive — and caused by humans Patrick Garvey walks on what's left of his farm as he talks about the destruction of his once-thriving enterprise by Hurricane Irma, in Big Pine Key, Fla. After Hurricanes Harvey, Irma and Maria blitzed the nation, most Americans think weather disasters are getting more severe and they see global warming's fingerprints all over them. THE ASSOCIATED PRESS Friday Nov 3, 2017 at 1:21 PM Heat waves, downpours and wildfires have become more frequent due to human activity, more than 50 U.S. government scientists say Wire Reports WASHINGTON — A wide-ranging 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. The rapid pace of global climate change is almost certainly driven by human activity, according to the government report, which contradicts assertions by President Donald Trump and members of his administration. "For the warming over the last century, there is no convincing alternative explanation supported by the extent of the observational evidence," said the report by a group of more than 50 U.S. government scientists released on Friday. The report, required by Congress every four years, was written by scientists from government bodies such as the Environmental Protection Agency and the National Oceanic and Atmospheric Administration. Future temperatures will depend heavily on the amount of carbon dioxide emitted into the atmosphere, the report said. Global average sea levels are expected to rise "at least several inches in the next 15 years" due to rising temperatures, it added. Trump has repeatedly called climate change a hoax, and in June announced that he would withdraw the United States from a global pact to combat it — calling the deal too costly for the U.S. economy. His EPA administrator, Scott Pruitt, has also expressed doubts about the causes of climate change, at one point saying he did not believe carbon dioxide from human activity is the primary driver. White House spokesman Raj Shah said: "The Administration supports rigorous scientific analysis and debate and encourages public comment on the draft documents being released today." Officials at the EPA did not immediately respond to requests for comment.