Trade-offs also pervade environmental policy: Cutting more of one pollutant, for example, leaves fewer resources to address other issues. For example, coal is phenomenally polluting, but it also provides for cheap and reliable power, which drives development.
取舍在环境政策中也很普遍：如果在削减某一类污染物上投入较多，那么留给解决其他问题的资源就会相应减少。比如说煤炭造成了惊人的污染，但它也提供了廉价和可靠的电力去推动发展。在过去的30年中，中国主要借助燃煤就使6.8亿人摆脱了贫困。其人均富裕程度也比过去增长了13倍有多。