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This report presents the basic results of an analysis of interrelationships of economic change and environmental impacts in the Lower Rio Grande Valley. The analytical method employed is an input-output model augmented to include environmental factors that are a part of the economic production process. Detailed information is presented on total dollar sales, purchases, exports and imports for 78 economic sectors and levels of use and/or output of 16 environmental factors. Direct and indirect effects on the environment of each sector's level of production are estimated, Trade-offs between economic factors and environmental factors are estimated in the form of environmental-income, environmental-employment and environmental-output multipliers. Economic and environmental impacts of possible, selected developments are presented.