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1250 Twenty-Fourth Street acid rain agencies agricultural air pollution American areas assessment biotechnology CF Letter CFCs changes chemicals commission concern Congress Conservation Foundation contaminants cooperation copies Costa Rica deforestation degradation developing countries ecological economic ecosystem effects efforts energy environment environmental problems environmental protection federal forest Forum Foundation 1250 Twenty-Fourth Foundation Letter genetic global goal groundwater habitat hazardous waste human impact implement important increased industrial Institute issues Jeffrey Leonard lake trout Lakes land Latin America levels long-term LWCF major ment mental million Montreal Protocol munities National Park natural resources organizations outdoor recreation ozone layer Park Service percent pest pesticides planning policies population growth potential President production programs recommendations reduce region risks River Soviet species Successful Communities tion tional tive toxic tropical U.S. Department United urban vironmental Washington Water Quality wetlands World Wildlife Fund