I did all of the green house gas emission estimates with the two online calculators listed below. Both are very easy to use.
Interactive Energy Calculators from the Texas State Energy Conservation Office:
This is a very flexible calculator
that allows you to estimate CO2 emissions from all the common sources.
Easy to use.
Its here: www.infinitepower.org/calculators.htm
Screen Shot:
Example of Ford Explorer compared to Toyota Prius:
Gary 08/04/06