As you think of what are the alternatives to this system -- it's important to find alternatives because it turns out that the U.S. is dwindling in its petroleum reserves, but it is not dwindling in its coal reserves, nor is China. There are huge coal reserves that are sitting out there, and we've got to start thinking of them as biological energy, because if we keep treating them as chemical energy, or engineering energy, we're
当你试图发现还有什么更好的选择， 找到一种替代性的方法是很重要的， 因为人们意识到美国的 石油储备在不断减少，但是 煤炭的储备并未减少，中国也是如此。 煤炭的储备量非常之大， 我们应该开始考虑把煤炭看作 生物能源，因为如果我们继续视其为 化学能源，或机械能源，我们