House Minority Leader John BoehnerJohn Andrew BoehnerDems face hard choice for State of the Union response Even some conservatives seem open to return to earmarks Overnight Finance: Trump, lawmakers take key step to immigration deal | Trump urges Congress to bring back earmarks | Tax law poised to create windfall for states | Trump to attend Davos | Dimon walks back bitcoin criticism MORE (R-Ohio) seemed to cast doubt on evidence that carbon emissions spur climate change during an interview Sunday morning on ABC.

"The idea that carbon dioxide is a carcinogen that is harmful to our environment is almost comical," Boehner said Sunday morning on ABC. "Every time we exhale, we emit carbon dioxide."

Boehner said that while it is "clear" there has been change in the global environment, the extent to which climate change is man-made is still unclear.

"I think it is an issue," he said, though Boehner declined to offer specifics beyond the traditional GOP approach of pushing for alternative and nuclear power in addition to increased oil and gas production.

"The question is what is the proper answer, and a responsible answer."

Boehner rejected the Obama administration's preferred cap-and-trade system, arguing that it'd unacceptably threaten the U.S. economy.

"It's pretty clear that if we don't work with other industrialized nations over the world, we're going to ship millions of jobs overseas," he said.