Why it Matters: Climate change

In this July 21 photo, the sun sets beyond visitors to Liberty Memorial as the temperature hovers around 100 degrees in Kansas City, Missouri.

File, AP

WASHINGTON — A federal climate report says the United States is already feeling the effects of climate change, with temperatures rising dramatically over the last four decades.

That's according to The New York Times, which acquired a draft copy of the report by scientists from 13 federal agencies.

The report says extreme heat waves have become more common and extreme cold waves less common since the 1980s.

It says emissions of greenhouse gases will affect the degree to which global temperatures continue to rise — a claim President Donald Trump and some members of his cabinet have disputed.

One scientist cited anonymously by the Times says he and other researchers are worried that the Trump administration, which must approve the report's release, will suppress it.

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