Graham jokes: If you said 'Mueller thinks climate change is a hoax,' then Trump would believe in it

Sen. Lindsey GrahamLindsey Olin GrahamGOP divided over impeachment trial strategy GOP eager for report on alleged FBI surveillance abuse Johnson opens door to subpoenaing whistleblower, Schiff, Bidens MORE (R-S.C.) told those gathered at a Dallas-based sustainability conference that President TrumpDonald John TrumpGOP divided over impeachment trial strategy Official testifies that Bolton had 'one-on-one meeting' with Trump over Ukraine aid Louisiana governor wins re-election MORE has a long way to go in acknowledging the science behind climate change.

“Climate change is real, the science is sound and the solutions are available," Graham said, adding jokingly, "If I told Trump that [special counsel Robert] Mueller thinks climate change is a hoax, we'd be well on our way."

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Trump has a long history of lashing out at both the special counsel investigation and global warming as a concept, repeatedly saying winter storms are a sign that climate change isn’t real.

Graham was speaking on a panel at the EarthX2019 conference with Sen. Sheldon WhitehouseSheldon WhitehouseDemocratic senators seek documents on Trump's alleged call for Barr press conference Senate committee advances budget reform plan Bipartisan Enzi-Whitehouse budget bill a very bad fix for deficits MORE (D-R.I) and Energy Secretary Rick PerryRick PerryHighly irregular: Rudy, the president, and a venture in Ukraine White House releases rough transcript of early Trump-Ukraine call minutes before impeachment hearing Overnight Energy: Perry replacement faces Ukraine questions at hearing | Dem chair demands answers over land agency's relocation | Ocasio-Cortez, Sanders unveil 0B Green New Deal public housing plan MORE.

For his part, Perry mirrored some of Trump’s vocal skepticism about renewable energy sources, according to reporting from the Dallas Business Journal.

"Some people just want to rely on them solely," he said. "Our air might be cleaner, but the energy supply isn't nearly as reliable. Imagine what a single natural disaster or cybersecurity attack would do to us when the sun doesn’t come out, or the wind doesn’t blow. The cost to our economy would be huge."

Trump has made a number of controversial false statements about renewable energy, including comments that wind turbines cause cancer and that a more wind-reliant future would mean people would not be able to watch TV if the wind stopped blowing.