Kyoto Protocol Adopted

On December 11, 1997, delegates from 160 countries adopted the Kyoto Protocol at the United Nations Framework Convention on Climate Change conference in Kyoto, Japan. It was the first international treaty to impose legally binding obligations on developed nations to reduce greenhouse gas emissions — targeting a 5% reduction below 1990 levels by 2012. The protocol introduced innovative mechanisms like carbon trading and the Clean Development Mechanism. However, the United States never ratified it, and developing nations including China and India were exempt from binding targets. Despite its limitations, Kyoto established the principle that wealthy nations bore primary responsibility for climate change and set the template for all subsequent climate negotiations.