CO2 Emissions, Electric Vehicles, the New EPA Label, and a Great Feature at Fueleconomy.gov

A Scientific American post in April (by Julia Pyper, originally posted on Climatewire) captured a basic challenge facing people who want to buy electric vehicles as a way of reducing greenhouse gas emissions:

An all-electric Nissan Leaf in Buffalo, N.Y., emits relatively few greenhouse gases, equal to the amount produced by a gasoline-powered car getting 86 mpg. But in Denver, the same Leaf is equivalent to only a 33-mpg vehicle, such as a subcompact Ford Fiesta.