Cash for Clunkers: The Environmental Cost of a New Car

[JonQ]

The short answer: 31,362 Btus per pound. That’s the average energy cost for constructing a modern motor vehicle —rubber, fluids, glass, metal and battery. Can that number tell you if it’s better, environmentally speaking, to keep your ’85 Renault Fuego or pick up a Honda Insight? That’s a longer answer full of scary science and scarier math. The U.S. Department of Energy’s Argonne National Lab has attempted to analyze the energy consumed manufacturing vehicles. Their creation is called Greenhouse gases, Regulated Emissions and Energy use in Transportation models. GREET. No really.

Argonne broke automobiles down to discrete parts, then measured the energy required to mine, make and move those parts. They assess in British thermal units, the amount of energy needed to raise the temperature of one pound of water one degree Fahrenheit.

Applying the GREET model, it takes 100.391 million Btus to make a 3,201-pound vehicle. Not all cars are created equal, but the model accounts for the differences. For instance, the batteries in a hybrid render a different formula. According to GREET, a Prius comes in at 38,650 Btus per pound. A 2009 BMW M3, with its light carbon fiber roof screws things up. Just ignore it. For the 90 percent of the vehicles on the road, it’s 31,362 Btus per pound.
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http://www.thetruthaboutcars.com/cash-for-clunkers-the-environmental-cost-of-a-new-car/


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An interesting analysis. It seems for many of the cars traded out the cash for clunkers program has led to a net gain in pollution, despite higher efficiency standards.