Key portion of the transcript:

STEPHANOPOULOS: Let me ask you then about energy. We showed your statement on the president’s decision through the EPA to regulate greenhouse gases. Also, you’ve come out against the president’s proposal to cap-and-trade carbon emissions. So what is the Republican answer to climate change? Is it a problem? Do you have a plan to address it?

BOEHNER: George, we believe that our — all of the above energy strategy from last year continues to be the right approach on energy. That we ought to make sure that we have new sources of energy, green energy, but we need nuclear energy, we need other types of alternatives, and, yes, we need American-made oil and gas.

STEPHANOPOULOS: But that doesn’t do anything when it comes to emissions, sir.

BOEHNER: When it comes to the issue of climate change, George, it’s pretty clear that if we don’t work with other industrialized nations around the world, what’s going to happen is that we’re going to ship millions of American jobs overseas. We have to deal with this in a responsible way.

STEPHANOPOULOS: So what is the responsible way? That’s my question. What is the Republican plan to deal with carbon emissions, which every major scientific organization has said is contributing to climate change?

BOEHNER: George, the idea that carbon dioxide is a carcinogen that is harmful to our environment is almost comical. Every time we exhale, we exhale carbon dioxide. Every cow in the world, you know, when they do what they do, you’ve got more carbon dioxide.