Environmental challenges fall into the same three categories, and most of what we think about are local environmental problems: air pollution, water pollution, hazardous waste dumps. But there are also regional environmental problems, like acid rain from the Midwest to the Northeast, and from Western Europe to the Arctic, and from the Midwest out the Mississippi into the dead zone of the Gulf of Mexico.
环境危机也可以被划分为类似的三种类型， 大部分我们经常想到的危机 都是局部的地方环境问题：空气污染、水污染 垃圾排放。但同时也有 区域性的环境为题，比如酸雨， 从中西部地区到东北部地区，从西欧 到北极，从密西西比以外 的中西部到墨西哥湾的死亡地带。