Here, the candidates’ goals are virtually identical: they both support a cap-and-trade system to make deep cuts in US greenhouse-gas emissions by 2050. Obama wants the goal to be an 80% reduction and McCain says 66%, but, since the next president will leave office no later than 2016, that difference is irrelevant.
竞选中最为主要的全球性伦理问题是气候变化问题。在这一问题上，候选人的目标几乎是一致的。他们都支持限额-交易机制，从而到2050年大幅度削减美国的温室气体排放。奥巴马想要削减80%，麦凯恩则为66%。但是，由于下一任总统最晚也要在2016年离任，所以，这一区别也就微不足道了。