The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?
我们生产的每一块塑料都应该有明确的再利用或回收路径。
Models are not crystal balls, but they are the best tools we have to understand the future.
实现可持续增长的唯一途径是拥抱变化并挑战现状。