煤炭的真实成本必须既考虑其即时价值,也考虑其对社区和生态系统的长期影响。
乳制品的未来在于可持续的实践和以消费者为导向的创新。
Trade between two countries can be mutually beneficial, even if one of them is less efficient in the production of all commodities.
有时最简单的想法能创造出最好的故事。