Following a “business as usual” policy, by 2200, the losses in GNP have an expected value of 13.8%, but with a degree of uncertainty that makes the expected loss equivalent to a certain loss of about 20%. Since the base rate of economic growth (before calculating the climate change effect) was taken to be 1.3% per year, a loss of 20% in the year 2200 amounts to reducing the annual growth rate to 1.2%.
利益是被避免的损害，包括市场损害以及导致对健康和生态影响的非市场损害。如果我们执行“一切照常”的政策，那么到2020年，国民生产总值的损失预计为13.8%，但是因为存在的不确定性，使得预计的损失大概为20%。因为经济的年基本增长率（未计算气候变化影响）被设定为1.3%，那么2020年损失20%相当于把年增长率降到1.2%。换句话说，减少温室气体排放的利益可以被表述为将现在到2020年的年增长率从1.2%提高到1.3%。