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I expect we'll be able to fairly precisely modify genetic code and learn what manipulates which attributes in the near future (25 years). That said, I would think nature would have already figured out how to efficiently break down nutrient poor stuff like wood and switchgrass, so I don't have much hope we'll come up with a better organism to do it.
US should eliminate most every subsidy so the true cost of things are reflected in the price. Then if we need to slow the consumption of certain things, tax accordingly.
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