IPCC 예측은 탄소 배출량을 줄이는데 전혀 성공하지 못할 것이라고 가정한 통상경영 추계방식(BAU) 사례에 근거했다.
The IPCC forecasts were predicated on a business-as-usual case that assumed that there would be no success at all in mitigating carbon emissions.