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acid deposition acid rain acres agri Amazon American Amish animals areas biological diversity Biosphere Reserve birds chemical Colorado Conservation International Costa Costa Rica costs countries crops culture dams Daniel Janzen dry forest earth Earthwatch ecological economy ecosystems environment environmental farm farmers fertility fish flow Flowforms gallons genetic groups habitat horse human Indian insects irrigation Isla Rasa katydids lakes land landscape Laura Gilpin little master living look Mayan medicine ment Mexico miles million moths mountains movement Muir Muir's Myrin Institute National Park native NATURE QUARTERLY organic Orion painting percent plants pollution population problems production protect rain forest region Richard Evans Schultes river sardines scientists Sea of Cortez servation Sierra soil species sphingids stone streams sustainable agriculture things thousand tion topsoil trees Valley watershed wild wilderness wildlife Yampa