Reduce yer Carbon Emissions

Move to the City, and then get rid of your car.

"There are density-related advantages for both travel and heating," says Dodman. "When you have a critical mass of people like in London or New York, public transport becomes a feasible option for many, while people in more rural areas rely more on cars. And a flat that is surrounded by others is more efficient to heat than a free-standing house."

DC is dirty, but still only 82% of the American average.