Part 257

This entry lists the most pressing and important environmental problems. The following terms and abbreviations are used throughout the entry: Acidification - the lowering of soil and water pH due to acid precipitation and deposition usually through precipitation; this process disrupts ecosystem nutrient flows and may kill freshwater fish and plants dependent on more neutral or alkaline conditions (see acid rain). Acid rain - characterized as containing harmful levels of sulfur dioxide or nitrogen oxide; acid rain is damaging and potentially deadly to the earth's fragile ecosystems; acidity is measured using the pH scale where 7 is neutral, values greater than 7 are considered alkaline, and values below 5.6 are considered acid precipitation; note - a pH of 2.4 (the acidity of vinegar) has been measured in rainfall in New England. Aerosol - a collection of airborne particles dispersed in a gas, smoke, or fog. Afforestation - converting a bare or agricultural space by planting trees and plants; reforestation involves replanting trees on areas that have been cut or destroyed by fire. Asbestos - a naturally occurring soft fibrous mineral commonly used in fireproofing materials and considered to be highly carcinogenic in particulate form. Biodiversity - also biological diversity; the relative number of species, diverse in form and function, at the genetic, organism, community, and ecosystem level; loss of biodiversity reduces an ecosystem's ability to recover from natural or man-induced disruption. Bio-indicators - a plant or animal species whose presence, abundance, and health reveal the general condition of its habitat. Biomass - the total weight or volume of living matter in a given area or volume. Carbon cycle - the term used to describe the exchange of carbon (in various forms, e.g., as carbon dioxide) between the atmosphere, ocean, terrestrial biosphere, and geological deposits. Catchments - assemblages used to capture and retain rainwater and runoff; an important water management technique in areas with limited freshwater resources, such as Gibraltar. DDT (dichloro-diphenyl-trichloro-ethane) - a colorless, odorless insecticide that has toxic effects on most animals; the use of DDT was banned in the US in 1972. Defoliants - chemicals which cause plants to lose their leaves artificially; often used in agricultural practices for weed control, and may have detrimental impacts on human and ecosystem health. Deforestation - the destruction of vast areas of forest (e.g., unsustainable forestry practices, agricultural and range land clearing, and the over exploitation of wood products for use as fuel) without planting new growth. Desertification - the spread of desert-like conditions in arid or semi-arid areas, due to overgrazing, loss of agriculturally productive soils, or climate change. Dredging - the practice of deepening an existing waterway; also, a technique used for collecting bottom-dwelling marine organisms (e.g., shellfish) or harvesting coral, often causing significant destruction of reef and ocean-floor ecosystems. Drift-net fishing - done with a net, miles in extent, that is generally anchored to a boat and left to float with the tide; often results in an over harvesting and waste of large populations of non-commercial marine species (by-catch) by its effect of "sweeping the ocean clean." Ecosystems - ecological units comprised of complex communities of organisms and their specific environments. Effluents - waste materials, such as smoke, sewage, or industrial waste which are released into the environment, subsequently polluting it. Endangered species - a species that is threatened with extinction either by direct hunting or habitat destruction. Freshwater - water with very low soluble mineral content; sources include lakes, streams, rivers, glaciers, and underground aquifers. Greenhouse gas - a gas that "traps" infrared radiation in the lower atmosphere causing surface warming; water vapor, carbon dioxide, nitrous oxide, methane, hydrofluorocarbons, and ozone are the primary greenhouse gases in the Earth's atmosphere. Groundwater - water sources found below the surface of the earth often in naturally occurring reservoirs in permeable rock strata; the source for wells and natural springs. Highlands Water Project - a series of dams constructed jointly by Lesotho and South Africa to redirect Lesotho's abundant water supply into a rapidly growing area in South Africa; while it is the largest infrastructure project in southern Africa, it is also the most costly and controversial; objections to the project include claims that it forces people from their homes, submerges farmlands, and squanders economic resources. Inuit Circumpolar Conference (ICC) - represents the roughly 150,000 Inuits of Alaska, Canada, Greenland, and Russia in international environmental issues; a General Assembly convenes every three years to determine the focus of the ICC; the most current concerns are long-range transport of pollutants, sustainable development, and climate change. Metallurgical plants - industries which specialize in the science, technology, and processing of metals; these plants produce highly concentrated and toxic wastes which can contribute to pollution of ground water and air when not properly disposed. Noxious substances - injurious, very harmful to living beings. Overgrazing - the grazing of animals on plant material faster than it can naturally regrow leading to the permanent loss of plant cover, a common effect of too many animals grazing limited range land. Ozone shield - a layer of the atmosphere composed of ozone gas (O3) that resides approximately 25 miles above the Earth's surface and absorbs solar ultraviolet radiation that can be harmful to living organisms. Poaching - the illegal killing of animals or fish, a great concern with respect to endangered or threatened species. Pollution - the contamination of a healthy environment by man-made waste. Potable water - water that is drinkable, safe to be consumed. Salination - the process through which fresh (drinkable) water becomes salt (undrinkable) water; hence, desalination is the reverse process; also involves the accumulation of salts in topsoil caused by evaporation of excessive irrigation water, a process that can eventually render soil incapable of supporting crops. Siltation - occurs when water channels and reservoirs become clotted with silt and mud, a side effect of deforestation and soil erosion. Slash-and-burn agriculture - a rotating cultivation technique in which trees are cut down and burned in order to clear land for temporary agriculture; the land is used until its productivity declines at which point a new plot is selected and the process repeats; this practice is sustainable while population levels are low and time is permitted for regrowth of natural vegetation; conversely, where these conditions do not exist, the practice can have disastrous consequences for the environment. Soil degradation - damage to the land's productive capacity because of poor agricultural practices such as the excessive use of pesticides or fertilizers, soil compaction from heavy equipment, or erosion of topsoil, eventually resulting in reduced ability to produce agricultural products. Soil erosion - the removal of soil by the action of water or wind, compounded by poor agricultural practices, deforestation, overgrazing, and desertification. Ultraviolet (UV) radiation - a portion of the electromagnetic energy emitted by the sun and naturally filtered in the upper atmosphere by the ozone layer; UV radiation can be harmful to living organisms and has been linked to increasing rates of skin cancer in humans. Waterborne diseases - those in which bacteria survive in, and are transmitted through, water; always a serious threat in areas with an untreated water supply. Country

Environment - current issues

Afghanistan limited natural fresh water resources; inadequate supplies of potable water; soil degradation; overgrazing; deforestation (much of the remaining forests are being cut down for fuel and building materials); desertification; air and water pollution

Akrotiri hunting around the salt lake; note - breeding place for loggerhead and green turtles; only remaining colony of griffon vultures is on the base

Albania deforestation; soil erosion; water pollution from industrial and domestic effluents

Algeria soil erosion from overgrazing and other poor farming practices; desertification; dumping of raw sewage, petroleum refining wastes, and other industrial effluents is leading to the pollution of rivers and coastal waters; Mediterranean Sea, in particular, becoming polluted from oil wastes, soil erosion, and fertilizer runoff; inadequate supplies of potable water

American Samoa limited natural fresh water resources; the water division of the government has spent substantial funds in the past few years to improve water catchments and pipelines

Andorra deforestation; overgrazing of mountain meadows contributes to soil erosion; air pollution; wastewater treatment and solid waste disposal

Angola overuse of pastures and subsequent soil erosion attributable to population pressures; desertification; deforestation of tropical rain forest, in response to both international demand for tropical timber and to domestic use as fuel, resulting in loss of biodiversity; soil erosion contributing to water pollution and siltation of rivers and dams; inadequate supplies of potable water

Anguilla supplies of potable water sometimes cannot meet increasing demand largely because of poor distribution system

Antarctica in 1998, NASA satellite data showed that the Antarctic ozone hole was the largest on record, covering 27 million square kilometers; researchers in 1997 found that increased ultraviolet light passing through the hole damages the DNA of icefish, an Antarctic fish lacking hemoglobin; ozone depletion earlier was shown to harm one-celled Antarctic marine plants; in 2002, significant areas of ice shelves disintegrated in response to regional warming

Antigua and Barbuda water management - a major concern because of limited natural fresh water resources - is further hampered by the clearing of trees to increase crop production, causing rainfall to run off quickly

Arctic Ocean endangered marine species include walruses and whales; fragile ecosystem slow to change and slow to recover from disruptions or damage; thinning polar icepack

Argentina environmental problems (urban and rural) typical of an industrializing economy such as deforestation, soil degradation, desertification, air pollution, and water pollution note: Argentina is a world leader in setting voluntary greenhouse gas targets

Armenia soil pollution from toxic chemicals such as DDT; the energy crisis of the 1990s led to deforestation when citizens scavenged for firewood; pollution of Hrazdan (Razdan) and Aras Rivers; the draining of Sevana Lich (Lake Sevan), a result of its use as a source for hydropower, threatens drinking water supplies; restart of Metsamor nuclear power plant in spite of its location in a seismically active zone

Aruba NA

Ashmore and Cartier Islands illegal killing of protected wildlife by traditional Indonesian fisherman, as well as fishing by non-traditional Indonesian vessels, are ongoing problems

Atlantic Ocean endangered marine species include the manatee, seals, sea lions, turtles, and whales; drift net fishing is hastening the decline of fish stocks and contributing to international disputes; municipal sludge pollution off eastern US, southern Brazil, and eastern Argentina; oil pollution in Caribbean Sea, Gulf of Mexico, Lake Maracaibo, Mediterranean Sea, and North Sea; industrial waste and municipal sewage pollution in Baltic Sea, North Sea, and Mediterranean Sea

Australia soil erosion from overgrazing, industrial development, urbanization, and poor farming practices; soil salinity rising due to the use of poor quality water; desertification; clearing for agricultural purposes threatens the natural habitat of many unique animal and plant species; the Great Barrier Reef off the northeast coast, the largest coral reef in the world, is threatened by increased shipping and its popularity as a tourist site; limited natural fresh water resources

Austria some forest degradation caused by air and soil pollution; soil pollution results from the use of agricultural chemicals; air pollution results from emissions by coal- and oil-fired power stations and industrial plants and from trucks transiting Austria between northern and southern Europe

Azerbaijan local scientists consider the Abseron Yasaqligi (Apsheron Peninsula) (including Baku and Sumqayit) and the Caspian Sea to be the ecologically most devastated area in the world because of severe air, soil, and water pollution; soil pollution results from oil spills, from the use of DDT pesticide, and from toxic defoliants used in the production of cotton

Bahamas, The coral reef decay; solid waste disposal

Bahrain desertification resulting from the degradation of limited arable land, periods of drought, and dust storms; coastal degradation (damage to coastlines, coral reefs, and sea vegetation) resulting from oil spills and other discharges from large tankers, oil refineries, and distribution stations; lack of freshwater resources (groundwater and seawater are the only sources for all water needs)

Bangladesh many people are landless and forced to live on and cultivate flood-prone land; waterborne diseases prevalent in surface water; water pollution, especially of fishing areas, results from the use of commercial pesticides; ground water contaminated by naturally occurring arsenic; intermittent water shortages because of falling water tables in the northern and central parts of the country; soil degradation and erosion; deforestation; severe overpopulation

Barbados pollution of coastal waters from waste disposal by ships; soil erosion; illegal solid waste disposal threatens contamination of aquifers

Belarus soil pollution from pesticide use; southern part of the country contaminated with fallout from 1986 nuclear reactor accident at Chornobyl' in northern Ukraine

Belgium the environment is exposed to intense pressures from human activities: urbanization, dense transportation network, industry, extensive animal breeding and crop cultivation; air and water pollution also have repercussions for neighboring countries; uncertainties regarding federal and regional responsibilities (now resolved) had slowed progress in tackling environmental challenges

Belize deforestation; water pollution from sewage, industrial effluents, agricultural runoff; solid and sewage waste disposal

Benin inadequate supplies of potable water; poaching threatens wildlife populations; deforestation; desertification

Bermuda sustainable development

Bhutan soil erosion; limited access to potable water

Bolivia the clearing of land for agricultural purposes and the international demand for tropical timber are contributing to deforestation; soil erosion from overgrazing and poor cultivation methods (including slash-and-burn agriculture); desertification; loss of biodiversity; industrial pollution of water supplies used for drinking and irrigation

Bosnia and Herzegovina air pollution from metallurgical plants; sites for disposing of urban waste are limited; water shortages and destruction of infrastructure because of the 1992-95 civil strife; deforestation

Botswana overgrazing; desertification; limited fresh water resources

Bouvet Island NA

Brazil deforestation in Amazon Basin destroys the habitat and endangers a multitude of plant and animal species indigenous to the area; there is a lucrative illegal wildlife trade; air and water pollution in Rio de Janeiro, Sao Paulo, and several other large cities; land degradation and water pollution caused by improper mining activities; wetland degradation; severe oil spills

British Indian Ocean Territory NA

British Virgin Islands limited natural fresh water resources (except for a few seasonal streams and springs on Tortola, most of the islands' water supply comes from wells and rainwater catchments)

Brunei seasonal smoke/haze resulting from forest fires in Indonesia

Bulgaria air pollution from industrial emissions; rivers polluted from raw sewage, heavy metals, detergents; deforestation; forest damage from air pollution and resulting acid rain; soil contamination from heavy metals from metallurgical plants and industrial wastes

Burkina Faso recent droughts and desertification severely affecting agricultural activities, population distribution, and the economy; overgrazing; soil degradation; deforestation

Burma deforestation; industrial pollution of air, soil, and water; inadequate sanitation and water treatment contribute to disease

Burundi soil erosion as a result of overgrazing and the expansion of agriculture into marginal lands; deforestation (little forested land remains because of uncontrolled cutting of trees for fuel); habitat loss threatens wildlife populations

Cambodia illegal logging activities throughout the country and strip mining for gems in the western region along the border with Thailand have resulted in habitat loss and declining biodiversity (in particular, destruction of mangrove swamps threatens natural fisheries); soil erosion; in rural areas, most of the population does not have access to potable water; declining fish stocks because of illegal fishing and overfishing

Cameroon waterborne diseases are prevalent; deforestation; overgrazing; desertification; poaching; overfishing

Canada air pollution and resulting acid rain severely affecting lakes and damaging forests; metal smelting, coal-burning utilities, and vehicle emissions impacting on agricultural and forest productivity; ocean waters becoming contaminated due to agricultural, industrial, mining, and forestry activities

Cape Verde soil erosion; deforestation due to demand for wood used as fuel; water shortages; desertification; environmental damage has threatened several species of birds and reptiles; illegal beach sand extraction; overfishing

Cayman Islands no natural fresh water resources; drinking water supplies must be met by rainwater catchments

Central African Republic tap water is not potable; poaching has diminished the country's reputation as one of the last great wildlife refuges; desertification; deforestation

Chad inadequate supplies of potable water; improper waste disposal in rural areas contributes to soil and water pollution; desertification

Chile widespread deforestation and mining threaten natural resources; air pollution from industrial and vehicle emissions; water pollution from raw sewage

China air pollution (greenhouse gases, sulfur dioxide particulates) from reliance on coal produces acid rain; water shortages, particularly in the north; water pollution from untreated wastes; deforestation; estimated loss of one-fifth of agricultural land since 1949 to soil erosion and economic development; desertification; trade in endangered species

Christmas Island loss of rainforest; impact of phosphate mining

Clipperton Island NA

Cocos (Keeling) Islands fresh water resources are limited to rainwater accumulations in natural underground reservoirs

Colombia deforestation; soil and water quality damage from overuse of pesticides; air pollution, especially in Bogota, from vehicle emissions

Comoros soil degradation and erosion results from crop cultivation on slopes without proper terracing; deforestation

Congo, Democratic Republic of the poaching threatens wildlife populations; water pollution; deforestation; refugees responsible for significant deforestation, soil erosion, and wildlife poaching; mining of minerals (coltan - a mineral used in creating capacitors, diamonds, and gold) causing environmental damage

Congo, Republic of the air pollution from vehicle emissions; water pollution from the dumping of raw sewage; tap water is not potable; deforestation

Cook Islands NA

Coral Sea Islands no permanent fresh water resources

Costa Rica deforestation and land use change, largely a result of the clearing of land for cattle ranching and agriculture; soil erosion; coastal marine pollution; fisheries protection; solid waste management; air pollution

Cote d'Ivoire deforestation (most of the country's forests - once the largest in West Africa - have been heavily logged); water pollution from sewage and industrial and agricultural effluents

Croatia air pollution (from metallurgical plants) and resulting acid rain is damaging the forests; coastal pollution from industrial and domestic waste; landmine removal and reconstruction of infrastructure consequent to 1992-95 civil strife

Cuba air and water pollution; biodiversity loss; deforestation

Curacao NA

Cyprus water resource problems (no natural reservoir catchments, seasonal disparity in rainfall, sea water intrusion to island's largest aquifer, increased salination in the north); water pollution from sewage and industrial wastes; coastal degradation; loss of wildlife habitats from urbanization

Czech Republic air and water pollution in areas of northwest Bohemia and in northern Moravia around Ostrava present health risks; acid rain damaging forests; efforts to bring industry up to EU code should improve domestic pollution

Denmark air pollution, principally from vehicle and power plant emissions; nitrogen and phosphorus pollution of the North Sea; drinking and surface water becoming polluted from animal wastes and pesticides

Dhekelia netting and trapping of small migrant songbirds in the spring and autumn

Djibouti inadequate supplies of potable water; limited arable land; desertification; endangered species

Dominica NA

Dominican Republic water shortages; soil eroding into the sea damages coral reefs; deforestation

Ecuador deforestation; soil erosion; desertification; water pollution; pollution from oil production wastes in ecologically sensitive areas of the Amazon Basin and Galapagos Islands

Egypt agricultural land being lost to urbanization and windblown sands; increasing soil salination below Aswan High Dam; desertification; oil pollution threatening coral reefs, beaches, and marine habitats; other water pollution from agricultural pesticides, raw sewage, and industrial effluents; limited natural fresh water resources away from the Nile, which is the only perennial water source; rapid growth in population overstraining the Nile and natural resources

El Salvador deforestation; soil erosion; water pollution; contamination of soils from disposal of toxic wastes

Equatorial Guinea tap water is not potable; deforestation

Eritrea deforestation; desertification; soil erosion; overgrazing; loss of infrastructure from civil warfare