미국은 1997년 협약 성립 당시 배출량 1위였음에도 교토 협약 비준을 거부했고, 중국은 당시에 개발 도상국으로 분류됐기 때문에 배출량을 줄일 의무를 면제받았다.
The United States refused to ratify the Kyoto Convention even though it was the no. 1 in emissions at the time of the establishment of the 1997 Convention, and China was exempt from its obligation to reduce emissions because it was classified as a developing country at the time.