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Originally Posted by EcoVan
Efficiency alone won't eliminate our reliance on fossil fuels. However, what no one seems to ever discuss is that there is a point we can probably return to where the earth's ability to absorb and process the pollution caused by fossil fuel use is in balance with our use.
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That's a good point.
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Moving the U.S fleet to diesel and limiting over the rad trucks I suspect would reduce fuel usage by at least 1/3.
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Not sure if moving the entire fleet to Diesel would be so easy, yet for light-duty trucks it does surprise me Diesels are more of an exception instead of the rule. In many countries it's uncommon to find gasser versions of certain trucks, including American imports such as the Silverado 1500 which now in Paraguay for instance is only available through official Chevrolet dealers as a Diesel.
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In addition, many efficiency improvements will greatly reduce the needs for alternative energy supplies, making those eventual changes much less costly, and therefore, much more likely to be adopted sooner (at least by those that are thinking clearly, instead of immersed in a haze of marketing)
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Another good point. Well, maybe the Brazilian experience replacing gasoline (partially) with ethanol was more successful because the local fleet revolved mostly around smaller cars than in the United States.