Everywhere you look today people are talking about the high price of gas and how we can reduce our usage. Now Design Within Reach is offering the Neuton Battery-Powered Mower to help. The Neuton's 24-volt rechargeable battery gives it enough charge to mow for 45 to 60 minutes and produces no CO2 emissions. Given that about 800 million gallons of gas are burned annually mowing lawns, this is a chance to make a big change.
Zero CO2 would be assuming your household power does from a non carbon based power plant. However I do concede your point as this is a great alternative. And I would bet it is also quieter, keeping the noise pollution down.