Here is an interesting opinion piece from the Wall Street Journal that contrasts Mitt favorably against all of the other candidates when it comes to global warming (thanks to EFM):

Global warming. Al Gore's movie "An Inconvenient Truth" has moved global warming to the top of the political agenda, and all the candidates with the exception of Mr. Romney seem to have signed on to federal regulation of factory emissions.

Mrs. Clinton is a global warming regulation advocate, and although the global climate warmed just one degree in the last century, Mr. Edwards says that "global warming is an emergency" and "a crisis today" that will no doubt require new taxes to do something about it. Mr. McCain and Mr. Obama have sponsored a bill that would over time reduce emissions to one-third of 2000 levels, which unless other nations do the same would have a devastating impact on America's jobs and economy. Mr. Giuliani believes that the debate on global warming is "almost unnecessary" since "the overwhelming number of scientists" believe there is a significant human cause."

Only Mr. Romney sees the challenge: "Kyoto-style sweeping mandates, imposed unilaterally in the United States, would kill jobs, depress growth and shift manufacturing to the dirtiest developing nations." And "Republicans should never abandon pro-growth conservative principles in an effort to embrace the ideas of Al Gore. Instead of sweeping mandates, we must use America's power of innovation to develop alternative sources of energy and new technologies that use energy more efficiently."