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Republican leader: Climate change science ‘not known’

The role that human activity plays in climate change “is not known,” according to a Republican leader in the Senate.

Sen. John BarrassoJohn Anthony BarrassoSenate passes long-delayed China bill OVERNIGHT ENERGY: Biden ends infrastructure talks with key Republican | Colonial Pipeline CEO grilled over ransomware attack | Texas gov signs bills to improve power grid after winter storm Republicans grill Biden public lands agency pick over finances, advocacy MORE (Wyo.), who serves on the GOP leadership team, has lambasted the Obama administration’s efforts to curb carbon emissions.

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Asked if human activity contributes to climate change, Barrasso responded, “The climate is constantly changing. The role human activity plays is not known.”

In an interview taped for C-SPAN’s “Newsmakers” program, Barrasso said there is bipartisan opposition to the new regulations issued by the Environmental Protection Agency on climate change. He added the regulations will harm the economy and noted that a Democratic Congress couldn’t pass a cap-and-trade bill in 2009 and 2010.

Barrasso’s remarks come about a month after Sen. Marco RubioMarco Antonio RubioFive years after the Pulse nightclub massacre the fight for LGBTQ+ rights continues Rubio calls on Biden to 'forcefully' confront Iran over movement of war ships Bipartisan lawmakers want Biden to take tougher action on Nicaragua MORE (R-Fla.) attracted criticism for saying he doesn’t believe “human activity is causing these dramatic changes to our climate the way these scientists are portraying it.”

He later clarified those comments to say climate change is real while stressing he is against cap-and-trade solutions.

“Newsmakers” will air Sunday at 10 a.m. and 6 p.m. on C-SPAN.