LYCOS RETRIEVER 
Pollution
built 133 days ago
Pollution is the contamination of air, water, or earth by harmful substances. Concern for pollution developed alongside concerns for the environment in general. See Environmental law. The advent of automobiles, increased chemical wastes, nuclear wastes, and accumulation of garbage in landfills created a need for legislation specifically aimed at decreasing pollution.
Source:
Pollution can ... be the consequence of a natural disaster. For example, hurricanes often involve water contamination from sewage, and petrochemical spills from ruptured boats or automobiles. Larger scale and environmental damage is not uncommon when coastal oil rigs or refineries are involved. Some sources of pollution, such as nuclear power plants or oil tankers, can produce widespread and potentially hazardous releases when accidents occur.
Source:
Pollution ... has a dramatic effect on natural resources. Ecosystems such as forests, wetlands, coral reefs, and rivers perform many important services for Earth’s environment. They enhance water and air quality, provide habitat for plants and animals, and provide food and medicines. Any or all of these ecosystem functions may be impaired or destroyed by pollution. Moreover, because of the complex relationships among the many types of organisms and ecosystems, environmental contamination may have far-reaching consequences that are not immediately obvious or that are difficult to predict. For instance, scientists can only speculate on some of the potential impacts of the depletion of the ozone layer, the protective layer in the atmosphere that shields Earth from the Sun’s harmful ultraviolet rays.
Source:
Pollution in the Arctic region has become an increasingly serious issue. The harsh living conditions and unique adaptations of Arctic plants and animals have made them especially vulnerable to contaminants in their environment. Many animals are being negatively impacted by increasing levels of a wide range of pollutants. Organic toxins, industrial emissions, heavy metals, and even radioactive material and are steadily accumulating in animal tissues, soils, and water. Animals high in the food chain, such as marine mammals, including polar bears, birds of prey, and some fish species are known to contain contaminant levels which exceed international thresholds.
Source:
Pollution exists in many forms and affects many different aspects of Earth’s environment. Point-source pollution comes from specific, localized, and identifiable sources, such as sewage pipelines or industrial smokestacks. Nonpoint-source pollution comes from dispersed or uncontained sources, such as contaminated water runoff from urban areas or automobile emissions.
Source:
Pollution production can be considered under the heading of the four major human activity sectors: industry, energy, transportation, and agriculture. With the marked increase in human population and the industrialization of much of the globe has come a whole new set of pollutants. Scientific advances based upon understanding the chemical and physical forces underlying nature have led to new processes and new products that have transformed society and have had a major positive impact on human health. But these industrial activities ... result in air and water emissions and contamination of the soil and of food as by-products of the processes involved in manufacture. The products themselves may be the means by which pollutants are distributed to the general population, such as lead poisoning through the use of lead in house paints. In the United States and other more wealthy countries, there recently has been a marked decline in industrial pollution emissions per unit produced.
Source:
MORE ABOUT
Pollution