As temperatures rise, however, the costs will rise and the benefits will decline, leading to a dramatic reduction in net benefits. After the year 2070, global warming will become a net cost to the world, justifying cost-effective climate action now and in the decades to come.
但是，随着温度的升高，成本会增加而收益会降低，导致净收益的大降。2070年后，全球变暖将成为世界的净负担，这意味着必须在今后数十年中采取高成本效益的气候行动。