On February 7, 2008, EPA announced the launch of a new Greenhouse Gas Calculator that can estimate greenhouse gas emission reductions. The calculator converts greenhouse gas-related savings estimates, typically presented in "million metric tons of carbon dioxide equivalents," into familiar terms such as the greenhouse gas emissions that would result from, among other activities, driving a particular number of cars for a year, using a particular amount of gasoline or barrels of oil, providing energy to a particular number of homes for a year, and recycling a particular quantity of waste instead of sending it to the landfill.
As EPA explains, "Users can enter savings in emissions, electricity consumption, gallons of gasoline, or number of vehicles into the calculator and determine up to 13 different ways to express the magnitude of the savings. The calculator uses the latest emission factors, approaches and statistics available through 2007."
For more information on the calculator, see http://www.epa.gov/cleanenergy/energy-resources/calculator.html.