It is often pointed out that it is the affluent countries that have caused the problem, owing to their higher greenhouse-gas emissions over the past two centuries. They continue to have the highest levels of per capita emissions, and they can reduce emissions with the least hardship.
常有人说，丰裕国家是造成问题的原因，因为它们在过去两百年中排放了更多的温室气体。它们的人均排放量仍然是世界最高，并且它们减排最不费力。毫无疑问，从道德上讲，世界发达国家应该在减排问题上起领导作用。