"I think it's very important to consider the energy needed to make a new car."
You could even take it a step further, and consider where the energy's likely to be coming from. Though in a global economy you can't easily pin it down 100%, if you buy a made-in-Japan Japanese car, or a French car, much less of the energy input is likely to come from fossil fuels than for one built in the US or (shudder) China.
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