The Environmental Protection Agency requires that new gas-powered lawn mowers come with catalytic converters.

CEI Expert Available to Comment: Director of Energy Policy Myron Ebell on what the EPA used to think about the effects of the catalytic converter:

“The catalytic converter is no longer an environmental savior, according to the New York Times [May 29, 1998]. Though the device sharply reduced smog emissions from autos, it may be out of favor at the Environmental Protection Agency. A new EPA study says that the converters break down the compounds of nitrogen and oxygen that then combine with hydrocarbons to form nitrous oxide, a greenhouse gas 300 times more potent than carbon dioxide.”