The Kyoto Protocol only required industrialized countries to reduce emissions, while the Paris Agreement recognized that climate change was a common problem and required all countries to set emission targets. United Nations Framework Convention on Climate Change (UNFCCC), 1992. The pioneering agreement [PDF], ratified by 197 countries, including the United States, was the first global agreement to explicitly address climate change. It has established an annual forum called the Conference of the Parties (COP) for international discussions aimed at stabilizing the concentration of greenhouse gases in the atmosphere. These meetings gave birth to the Kyoto Protocol and the Paris Agreement. Montreal Protocol, 1987. .