Yes, the sun is hot, but carbon dioxide also plays a role

Austin American Statesman - This spring, Katharine Hayhoe, a Texas Tech University climate scientist, briefed the Austin City Council on the consequences of climate change on Texas. Scientists generally agree that industrial and auto emissions from the burning of fossil fuels contribute to global warming.

But Don Zimmerman, the council member representing District 6, was dismissive of Hayhoe's presentation, saying there's "no way to have definitive science on something so nebulous and so foolish as climate change."

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