The environmental history of Latin America has become the focus of a number of scholars, starting in the later years of the twentieth century. But historians earlier than that recognized that the environment played a major role in the region's history. Environmental history more generally has developed as a specialized, yet broad and diverse field. According to one assessment of the field, scholars have mainly been concerned with "three categories of research: colonialism, capitalism, and conservation" and the analysis focuses on narratives of environmental decline.[1] There are several currents within the field. One examines humans within particular ecosystems; another concerns humans’ cultural relationship with nature; and environmental politics and policy.[2] General topics that scholars examine are forestry and deforestation; rural landscapes, especially agro-export industries and ranching; conservation of the environment through protected zones, such as parks and preserves; water issues including irrigation, drought, flooding and its control through dams, urban water supply, use, and waste water. The field often classifies research by geographically, temporally, and thematically.[3] Much of the environmental history of Latin America focuses on the nineteenth and twentieth centuries, but there is a growing body of research on the first three centuries (1500-1800) of European impact.[4] As the field established itself as a more defined academic pursuit, the journal Environmental History was founded in 1996, as a joint venture of the Forest History Society and the American Society for Environmental History (ASEH).[5] The Latin American and Caribbean Society for Environmental History (SOLCHA) formed in 2004.[6][7] Standard reference works for Latin American now include a section on environmental history.[8][9]