Speaking at the White House, Mr Trump said: "I've seen it, I've read some of it, and it's fine".
A long-awaited climate report that the Trump administration released on Black Friday reportedly in an attempt to bury the news, shows that climate change is already having a dramatic effect on life in the US, and that among the things it will damage is the American economy.
"This is, unfortunately, par for the course for this president that he would try to bury this news and deny it", Jake Levine said on MSNBC after the Trump administration released the report.
The report is mandated by law every few years and is based on hundreds of previously research studies.
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On Friday, Tijuana Mayor Juan Manuel Gastelum declared a humanitarian crisis in his city, which is home to 1.6 million people. There, some attempted to get through the fencing and wire separating the two countries, leading USA agents to fire tear gas.
Disasters will cost the US hundreds of billions of dollars in lost economic activity and damage the health of millions, according to the US National Climate Change Assessment published on Friday. It said that projections of further damage could change if greenhouse gas emissions are sharply curbed, even though numerous impacts of climate change (including more frequent and more powerful storms, droughts and flooding) are already under way.
The Trump administration has tried to downplay the dire findings of the consensus analysis, which concludes climate change could cost the U.S. economy hundreds of billions of dollars and thousands of lives each year in future.
"No, no, I don't believe it", he continued.
"While President Trump continues to ignore the threat of climate change, his own administration is sounding the alarm", Abigail Dillen, president of the environmental group Earthjustice, told Reuters.
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The company has said tariffs on imported steel, imposed earlier this year by the Trump administration, have cost it $1 billion. In Ontario, it plans to halt production of the Chevrolet Impala and Cadillac XTS by the final quarter of 2019.
The Congressionally-mandated report, written with the help of more than a dozen USA government agencies and departments, outlined the projected impacts of global warming in every corner of American society, in a dire warning at odds with the Trump administration's pro-fossil fuels agenda. Without a course change, increasingly depleted groundwater, rising seas and other effects will make it more hard to farm and provide enough water for large cities.
"I don't believe it", Trump said of the 1,600-page report by some 300 researchers from 13 federal agencies issued by the White House last week.
Climate change is already causing devastating consequences. "This report underscores what we are already seeing firsthand: climate change is real, it's happening here, and it's happening now". Those prodded for a response offered various answers, ranging from a dismissal of its conclusions to supporting some type of action to mitigate the effects of a warming planet as long as it did not impede economic growth.
The 29-chapter report details the nature of these risks, which range from direct and indirect effects on human health to economic and agricultural concerns. But the report makes clear that changes today can make a big difference. Days after it went out, reporters were still writing news stories and Republican lawmakers were pressed to respond to its findings on Sunday news shows - including on Fox News.
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GM also plans to close an assembly plant and a transmission plant in OH , along with an assembly plant in Canada. Chris Van Hollen said in a statement that he was "deeply disappointed and frustrated" with the company.
As an example, the report notes that flooding in Thailand in 2011 disrupted production of Ford and Honda vehicles in the US and cost a USA -based hard drive manufacturer $199 million in losses.