CNN "State of the Union" interviews during 2015: on Energy & Oil

Donald Trump: Maybe some climate change is manmade, but not all

A: Well, there could be some manmade, too. I mean, I'm not saying there's zero, but not nearly to the extent [others say]. When Obama gets up and said it's the number one problem of our country--and, if it is, why is it that we have to clean up our factories now, and China doesn't have to do it for another 30 or 35 years in their wonderful agreement, you know, our wonderful negotiators?

Rick Santorum: Nothing the US could do will affect global warming

SANTORUM: Is the climate warming? Clearly over the past 15 or 20 years the answer is yes. The question is, number one, "does man having a significant impact on that?" And number two, and this is even more important than the first, "is there anything the United States can do about it?" And the answer is clearly, no. Even folks who accept all of the science by the alarmists on the other side, recognize that everything that's being considered by the US will have almost--well, not almost, will have zero--impact on it given what's going on in the rest of the world.

Q: So, is your answer do nothing?

SANTORUM: Well, if it has no impact, of course do nothing. Why would you do something and with people admitting that even if you do something, it won't make a difference?