Is Mitt Romney tweaking his position on global warming?

The former Massachusetts governor had been one of the few Republican presidential candidates to embrace the scientific consensus that human activity contributes to climate change. But in a speech in Pittsburgh on Thursday, he sounded like more of a skeptic.

“My view is that we don’t know what’s causing climate change on this planet,” Romney said in the speech, a clip of which was posted by the liberal blog Think Progress. “And the idea of spending trillions and trillions of dollars to try to reduce CO2 emissions is not the right course for us.”

Romney gave a different answer in June, when he was asked whether humans contribute to climate change.

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