Keep in mind that Gingrich has been asked about this repeatedly for a decade now. His position has always been that "We don't know what is causing it."
Personally, I don't know what to think. I believe that there are some problems with how scientists are currently measuring the planet's temperature versus even 50 years ago. If they say that CO2 levels are going up, based on ice core samples, I can accept that with the caution that we know that research HAS been falsified for political agendas. And we also know that any increase in CO2 should be taken care of by increase green plant activity. And we don't really know that the types of increases people are talking about have any real effect on global temperatures.
In short, I'm with Newt on this one: Ignoring scientific research jest because we don't agree with the researchers politically is stupid. There may or may not be something going on, but we need to know a lot more.
Bottom line is that opposition to neither global warming nor an individual health care mandate started out as some kind of core, biblical, conservative principle. Over time the movement has more or less found a consensus on them, but it is reasonable to assume that a thinking individual would mull them over and study them for a while before drawing final conclusions. There is no reason to doubt that Newt will stick to what his stated positions on those issues are in the campaign when he is elected into office.
Anyone who buys into that sh** even a little, needs to have their heads examined.