Offered without comment -- via Think Progress, Rep. Joe Barton (R-TX), on the Obama administration's efforts to regulate carbon dioxide:
Barton says the average healthy adult exhales between four-tenths of a ton and seven-tenths of a ton of CO2 a year.
"So if you put 20,000 marathoners into a confined area, you could consider that a single source of pollution, and you could regulate it," Barton says. "The key would be whether the EPA said that 20,000 people running the same route was one source or not."
One indication that the EPA likely would consider 20,000 runners a single source of pollution is that the agency is trying to regulate waste-water runoff and emissions of drilling rigs in oil fields by attempting to define entire areas as a single source of pollution, Barton says.