This exploratory paper addresses the relationship of science journalism, science communication, environmental activism, and social movements. It draws on data from Latin America, exploring how journalists and activists use science communication as a tool for telling stories about environmental conflicts that frequently turn violent (more than 1600 land and environmental activists lost their lives between 2002 and 2020 in Latin America, more than three times that of all other regions of the world combined). The main goal of the paper is to understand how scientific storytelling by NGOs helps them present their points of view for journalists and to influence public opinion. Our data is drawn from the formal reports of four NGOs and from semi-structured interviews with representatives from each NGO’s staff about their use of science communication. Our analysis suggests that Latin American NGOs use science communication tools such as scientific storytelling and scientific explanation to support journalists and to communicate with broad publics about complex phenomena such as socio-environmental conflicts, contributing to efforts to reduce the alarming amount of violence in the region.