I question the objectivity of someone who writes the following:

"When someone fills their early model Hummer with a thousand gallons of gasoline and chugs around the suburbs with the air conditioning on and the windows open, one needn’t account for the exhaust plume coming out of the tailpipe—that is a negative externality. The pollution that the residents’ ears and lungs of said suburb and the surrounding area must endure is not accounted for in the price of gasoline."