"The weight of evidence [for global warming] over time [convinced me] that it's something that you ought to be careful about.... How do you design a pro-science and pro-technology strategy that lowers the amount of damage the human race does to the planet?" - Feb. 15, 2007
"I actually don't know whether global warming is occurring.... The earth's temperatures go up and down over geologic times over and over again. As recently as 11,000 years ago the Gulf Stream quit for 600 years. And for 600 years you had an ice age in Europe because there was no warm water coming up. And then it started up again. Nobody knows why it quit, nobody knows why it started up. I'm agnostic." - Nov. 9, 2011
Gingrich has a complicated relationship with climate change that stretches back to 1989, when he co-sponsored the Global Warming Prevention Act. The former House speaker expressed support for a cap-and-trade system in 2007 but turned against the scheme a year later, and has called his decision to appear with Nancy Pelosi in a 2008 ad urging government action on climate change "the dumbest single thing I've done in the last few years." Even with these shifts in position, however, Gingrich has consistently argued that conservatives must offer innovative, market-based environmental solutions and that there is evidence on both sides of the climate-change debate.