Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) told those gathered at a Dallas-based sustainability conference that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests 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 Whitehouse Sheldon WhitehouseFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Hillicon Valley: Murky TikTok deal raises questions about China's role | Twitter investigating automated image previews over apparent algorithmic bias | House approves bill making hacking federal voting systems a crime House approves legislation making hacking voting systems a federal crime MORE (D-R.I) and Energy Secretary Rick Perry Rick PerryEnergy secretary questions consensus that humans cause climate change OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium OVERNIGHT ENERGY: Trump signs major conservation bill into law | Senate votes to confirm Energy's No. 2 official | Trump Jr. expresses opposition to Pebble Mine project 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.