The League of Women Voters has been airing ads calling on Senators Scott Brown (R-MA) and Claire McCaskill (D-MO) to protect people rather than polluters.  The ads are designed to educate voters about the public health consequences that would occur if amendments these Senators voted for had become law.

The factual basis for the ads is the formal determination by the Environmental Protection Agency that greenhouse gases, such as carbon dioxide and methane, endanger public health and welfare.

The largest sources of these emissions are power plants (“smokestacks”) and automobiles (“tailpipes”).
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