This depends on a lot of factors. First of all is the commercial viability of cellulosic ethanol to be able to break down lignans into an easily usable fuel. Crops such as sugarcane, switchgrass and miscanthus are much more productive then tree’s at creating biomass fast and may prove to be the pathway of choice for producing biofuels. Tree’s that are genetically modified to grow faster are also being considered. But in the big picture, there simply isn’t enough net primary productivity to replace fossil fuels at the current rate of consumption.
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