Romney becomes a full-fledged denier? Romney: 'We Don't Know What's Causing Climate Change'

It made him stammer, but he did it. Romney: 'We Don't Know What's Causing Climate Change'

Here’s what Mitt Romney said in in Pittsburgh yesterday:

My view is that we don’t know what’s causing climate change on this planet. And the idea of spending trillions and trillions of dollars to try to reduce CO2 emissions is not the right course for us.

Watch the video for the stammer.