I think as individuals, people overrate the virtues of local food. Most of the energy consumption in our food system is not caused by transportation. Sometimes local food is more energy efficient. But often it's not. The strongest case for locavorism is to eat less that's flown on planes, and not to worry about boats.

Presidents always want to do nice, noble, long-run things, and Congress is less keen to do so. We've seen that throughout the history of this country.

To get anything done, Obama has to be seen as having winning economy - which isn't easy.

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