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 BarrassoTrump to nominate three to nuclear commission Time is now to address infrastructure needs Trump's infrastructure plan won't contain list of projects 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 RubioDHS extends protected status for Haitians for six months Congress should let local communities set their own PACE Rubio: ‘People got what they voted for’ 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.