Casa Pueblo began as a grassroots citizens’ group formed to oppose the Puerto Rican government’s plan to allow large-scale open-pit mining by international corporations in the central region in 1980. Its aims have since evolved into promoting community self-reliance and community-based self-management, while conserving cultural heritage and local and national ecological integrity. Its philosophy is based on a “social transformation model”, with the affirmation of cultural (local) values, the reinforcement of self-esteem and the promotion of self-reliance and self-responsibility. This is implemented through community culture (i.e. through the use of art, music and field action), information gathering, sound science and research, and self-sufficiency through community enterprises such as coffee production, a community store and eco-tourism. In addition to successfully preventing the planned mining project, Casa Pueblo has also changed national mining and forestry policy. It has promoted sustainable forestry, developing a string of pro-poor, pro-environment forest reserves, and has also: developed a model of community-based forest management; influenced government to create a national forest fund for the purchase and conservation of land of high ecological value; created the nation’s first biological corridor; shaped landscapes through encouraging better farming practices; launched an environmental education programme; brought scientific advice into the organization; and demonstrated options for the use of renewable energy.