MYRTLE BEACH, S.C. - Mitt Romney took a jab at GOP frontrunner Newt Gingrich today during a town hall meeting for an ad the former speaker filmed with Democratic minority leader Nancy Pelosi aimed at spreading awareness on climate change.

Asked about his views on global warming by an audience member, Romney responded without missing a beat, "First of all, I'm not planning on cutting an ad with Nancy Pelosi."

The crowd erupted in applause.

"In all fairness, Speaker Gingrich also said that was the biggest mistake of his life," Romney quickly added, laughing.

Romney was referring to an ad, titled "We Can Solve It," that was released in 2008 and featured Gingrich and then-Speaker of the House Nancy Pelosi sitting on a couch together urging people to address global warming.

While Romney was joking today, his campaign has used the ad, which was made on behalf of former Vice President Al Gore's nonprofit "Alliance for Climate Protection," as a way to align Gingrich with the left while also labeling him as an "unreliable leader."

In a web video made by the Romney campaign called "Newt and Nancy," footage from the 2008 ad is used. The Romney campaign released a statement with the ad earlier this week writing, "When Al Gore needed support for his liberal global warming agenda, he turned to Nancy Pelosi and Newt Gingrich to film an advertisement together. Filming an ad with Nancy Pelosi is another example of Newt Gingrich being an unreliable conservative and an unreliable leader."

At the town hall, Romney continued after the reference to Gingrich, outlining his position on climate change.

"I am not a scientist. I have not built a model of how the environment, the earth works," Romney said. "I think the Earth is getting warmer. I may be wrong. Number two, I think we contribute to that. Number three, I don't know how much we contribute to that.

"My energy policy does not say let's spend trillions and trillions of dollars to stop the emission of green house gases, instead let's develop the energy resources we have in America," he said.