Total renewable water resources:
3,069 cu km (1985)
Freshwater withdrawal (domestic/industrial/agricultural):
total: 477 cu km/yr (13%/46%/41%) per capita: 1,600 cu m/yr (2000)
Natural hazards:
tsunamis, volcanoes, and earthquake activity around Pacific Basin; hurricanes along the Atlantic and Gulf of Mexico coasts; tornadoes in the midwest and southeast; mud slides in California; forest fires in the west; flooding; permafrost in northern Alaska, a major impediment to development
Environment - current issues:
air pollution resulting in acid rain in both the US and Canada; the US is the largest single emitter of carbon dioxide from the burning of fossil fuels; water pollution from runoff of pesticides and fertilizers; limited natural fresh water resources in much of the western part of the country require careful management; desertification
Environment - international agreements:
party to: Air Pollution, Air Pollution-Nitrogen Oxides,
Antarctic-Environmental Protocol, Antarctic-Marine Living Resources,
Antarctic Seals, Antarctic Treaty, Climate Change, Desertification,
Endangered Species, Environmental Modification, Marine Dumping,
Marine Life Conservation, Ozone Layer Protection, Ship Pollution,
Tropical Timber 83, Tropical Timber 94, Wetlands, Whaling
signed, but not ratified: Air Pollution-Persistent Organic
Pollutants, Air Pollution-Volatile Organic Compounds, Biodiversity,
Climate Change-Kyoto Protocol, Hazardous Wastes