Historians are only beginning to appreciate the contribution of Asia Pacific activists to modern environmentalism. Often portrayed as an American and European accomplishment, the history of environmentalism is undergoing radical re-conceptualisation as a global and transnational phenomenon. Japan is central to this narrative. Facing a domestic pollution crisis in the 1970s, Japanese activists went global, communicating the story of pollution to international organisations, the foreign media, and environmental NGOs. They relentlessly pursued Japanese corporate pollution throughout the Asia-Pacific and forged transnational ties with activists worldwide. In the process, Japanese activists and their regional allies shaped the environmental movement we know today.