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OK I see your point. However, there is another problem. If you start using plants to make oil (and you will still essentially be using plants even if you are using animals, since they eat plants), you will be destroying a whole lot of plant life, which has already been decreasing pretty fast. Planting more plants would not work either, since plants take a whole lot more time to grow than we would be using them for our ever-expanding need of gasoline and other such products. It's a very attractive source of energy, yet I don't think it will do the environment as much good as it will do bad.
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