Should the government stop regulating natural human sewage output?

A frequent argument put forth by global warming contrarians is that the government/EPA shouldn't be able to regulate CO2 because it's a natural byproduct of human breathing. The Texas Attorney General recently made this argument: "It is almost the height of insanity of bureaucracy to have the EPA... show more A frequent argument put forth by global warming contrarians is that the government/EPA shouldn't be able to regulate CO2 because it's a natural byproduct of human breathing. The Texas Attorney General recently made this argument:

"It is almost the height of insanity of bureaucracy to have the EPA regulating something that is emitted by all living things."

Joseph Romm points out that based on this logic, the government shouldn't address sewage either. Paul Krugman points out that before London built a sewage system in the 1850s, 'The Economist' basically made this same argument - sh*t happens.
http://krugman.blogs.nytimes.com/2011/01...

What do you think - should we follow the advice of the Texas AG, go back to the 1850s, and let people start crapping in the street?
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