As far as the environment of United States is concerned, there have been air pollution; large emitter of carbon dioxide from the burning of fossil fuels; water pollution from runoff of pesticides and fertilizers; declining natural freshwater resources in much of the western part of the country require careful management; deforestation; mining; desertification; species conservation; invasive species (the Hawaiian Islands are particularly vulnerable). As for nvironment - international agreements, we have; Air Pollution, Air Pollution-Heavy Metals, Air Pollution-Multi-effect Protocol, Air Pollution-Nitrogen Oxides, Antarctic-Environmental Protection, Antarctic-Marine Living Resources, Antarctic Seals, Antarctic Treaty, Climate Change, Climate Change-Paris Agreement, Desertification, Endangered Species, Environmental Modification, Marine Dumping-London Convention, Marine Life Conservation, Nuclear Test Ban, Ozone Layer Protection, Ship Pollution, Tropical Timber 2006, Wetlands, Whaling.