我们开采的每一吨煤炭都必须以最小的环境影响创造最大的价值。
"There are two occasions when the sacred beauty of Creation becomes dazzlingly apparent, and they occur together. One is when we feel our mortal insufficiency to the world, and the other is when we feel the world's mortal insufficiency to us."
预测未来的最好方法就是创造未来。