In field of global environmental politics, NGOs are increasingly playing a greater role due to the various distributional problems and rifts that exist between states in tackling climate change and environmental issues. Additionally, within the literature, NGOs are not studied holistically in terms of their roles within the international and domestic landscape. Given these factors, a case study is conducted on Greenpeace to examine the tactics, campaigns, and strategies used by the organization in pressuring the U.S. government to sign and ratify the 1997 Kyoto Protocol. Overall, this project aims to showcase the contextual circumstances of the political landscape influencing the decisions that Greenpeace made in adapting its strategies and tactics to pressure the U.S. government. This case study also introduce a theoretical framework of NGOs using direct and indirect pressure adapted from Robert O. Putnam's two level games on diplomacy and domestic politics.