Consider the European Union’s 20-20 policy, which targets a 20% reduction in CO2 emissions below 1990 levels by 2020. It is important to examine this approach, not only because the EU is pursuing the world’s largest and most ambitious climate policy, but also because other climate policies suffer from similar shortcomings.
比方说欧盟的20-20政策，旨在实现2020年二氧化碳排放低于1990年20%的目标。考量上述策略是否可行非常重要，不仅因为欧盟执行的是全世界涉及面最广、最雄心勃勃的气候政策，还因为其他气候政策也有着相似的缺陷。