A potentially vast source of renewable energy sits just out of our grasp. Each year, more than 40 million tonnes of inedible plant material, including wheat stems, corn stover (the stalks and leaves) and wood shavings from logging, are produced — much of which is thrown away. Turning these discarded, woody bits of plants into 'second-generation' biofuels — which will not take food away from a hungry planet — has huge appeal.
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