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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 BarrassoBiden returns to Obama-era greenhouse gas calculation Indigenous groups post billboards urging senators to confirm Deb Haaland Senate confirms former Michigan governor Granholm as Energy secretary 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 RubioDeSantis derides 'failed Republican establishment' at CPAC The Hill's 12:30 Report - Presented by Facebook - Divided House on full display Mehdi Hasan gets MSNBC Sunday prime-time show 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.