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Americans are already feeling the effects of climate change, according to a leaked US report.

Since 1980, the average temperature in the US has risen significantly, with the past few decades the warmest for 1500 years.

The report, written by scientists from 13 federal agencies, is still awaiting approval from the Trump administration before it can be officially published, but a draft copy was

“Evidence for a changing climate abounds, from the top of the atmosphere to the depths of the oceans,” say the authors in the draft report, with thousands of studies contributing to an irrefutable body of evidence.

“Many lines of evidence demonstrate that human activities, especially emissions of greenhouse (heat-trapping) gases, are primarily responsible for recent observed climate change,” they say.

The report points out that the ability to attribute some extreme weather events to climate change is improving. It says there is relatively strong evidence that humans contributed to the European heatwave in 2003 and the record temperatures in Australia in 2013. Globally, it is extremely likely that humans are responsible for over half the mean temperature increase since 1951, the authors say.

The leak comes as it was that senior officials at the US Department of Agriculture are now instructing staff to speak about “weather extremes” instead of climate change.

“It is disturbing that scientists had to leak a draft of a new government report warning of dire climate change impacts because they fear the Trump administration will try to suppress it,” says , professor of atmospheric science at Pennsylvania State University. “Orwell’s Ministry of Truth has arrived.”

Read more: We are on track to pass 1.5°C warming in less than 10 years