Top science groups tell climate change doubters in Congress to knock it off

More than half of the Republicans in Congress question the science of human-caused climate change, according to the Center for American Progress. The presumptive Republican nominee for president, Donald Trump, has also said he is not “a great believer in man-made climate change.”

In a letter dated June 28, 2016, 31 leading U.S. scientific organizations sent members of Congress a no-nonsense message that human-caused climate change is real, poses risks to society and is backed by overwhelming evidence.

“Observations throughout the world make it clear that climate change is occurring, and rigorous scientific research concludes that the greenhouse gases emitted by human activities are the primary driver,” the letter states. “This conclusion is based on multiple independent lines of evidence and the vast body of peer-reviewed science.”

“For the United States, climate change impacts include greater threats of extreme weather events, sea level rise, and increased risk of regional water scarcity, heat waves, wildfires, and the disturbance of biological systems,” the updated 2016 letter says. “The severity of climate change impacts is increasing and is expected to increase substantially in the coming decades.”

Since 2009, the planet has experienced its two warmest years on record, 2015 and 2014, while atmospheric levels of carbon dioxide have risen relentlessly, passing 400 parts per million.

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