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It's my science fiction story, so I'm going to say the tree we engineered for this was the sugar maple: you can put a tap in it and collect highly pure diesel fuel with a pre-Columbian level of technology.

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No no, you integrate the pump directly into the tree. Skip the farms, just plant the trees at the station in place of the current pumps.

Forest fires would definitely get a lot more exciting.

Maybe that's quite the reason why we didn't do it :)

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