(CNSNews.com) – In an interview on CBS’s “Face the Nation” on Sunday, GOP presidential candidate Sen. Marco Rubio (R-Fla.) said he believes “humans are not responsible for climate change in the way” some want people to believe.

“Humans are not responsible for climate change in the way some of these people out there are trying to make us believe, for the following reason: I believe climate is changing, because there's never been a moment where the climate is not changing,” said Rubio.

Rubio questioned how much former Vice President Al Gore’s proposed cap and trade system would actually change the pace of climate change and how much it will cost the U.S. economy.

“The question is, what percentage of that or what is due to human activity? If we do the things they want us to do, cap and trade, you name it, how much will that change the pace of climate’s change vs. how much will it cost to our economy?” Rubio said.

“Scientists can't tell us what impact it would have on reversing these changes, but I can tell you with certainty it would have a devastating impact on our economy,” he added.