Which sentence BEST supports the inference that biofuels may become more cost-effective in the future?
After a year of planting corn, a farmer might plant a different crop the next year, in order to put nitrogen back into the soil.
As the demand for corn or soybeans goes up and the supply available for food goes down, the price of food goes up.
Second, using current technology, biofuels take more energy than they give!
This particular study showed that it takes 129 units of energy to produce enough ethanol to generate 100 units of energy.
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Which sentence BEST supports the inference that biofuels may become more cost-effective in the futur...
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