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

Sen. Lindsey GrahamLindsey Olin GrahamThe risks of staying in Afghanistan far outweigh the risk of withdrawal Republicans turning against new round of ,200 rebate checks Calls for police reform sparks divisions in Congress MORE (R-S.C.) told those gathered at a Dallas-based sustainability conference that President TrumpDonald John TrumpTrump says inviting Russia to G7 'a question of common sense' Pentagon chief does not support invoking Insurrection Act Dershowitz: Does President Trump have power to declare martial law? 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 WhitehouseFederal judges should be allowed to be Federalist Society members Warren condemns 'horrific' Trump tweet on Minneapolis protests, other senators chime in IRS proposes guidance for expanded carbon capture tax credit MORE (D-R.I) and Energy Secretary Rick PerryRick PerryCoronavirus Report: The Hill's Steve Clemons interviews Ernest Moniz Trump issues executive order to protect power grid from attack Why we need to transition, quickly, from fossil fuels to clean energy 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.