[we need on essay on environment in kannada language.[/size][/font]

Pollution introduction of pollutants into the environment that cause negative changes. [Pollution can take the form of chemical substances, or energy, such as noise, heat, or light. contaminants, pollution, components can be either foreign matter/energy or natural pollution pollution is often classed as point source or point sources of pollution.

Ancient cultures

Air pollution is always accompanied by civilization. Pollution began in prehistoric times, when people created the first fires. According to a 1983 article in the journal Science, "soot found on the ceilings of prehistoric caves provides ample evidence of high levels of pollution, that was due to insufficient ventilation open fire."Forging of metals appears to be the key turning point in the creation of significant air pollution levels outside the home. Core samples of glaciers in Greenland indicate increases in pollution associated with Greek, Roman and Chinese metal production, but at the time it was relatively less pollution and can be processed by nature.

Modern awareness

Pollution has become a popular issue after World War II, due to the nuclear fallout from the atomic war and testing. Then, the non-nuclear event, the great smog of 1952 in London, killing at least 4000 people. [This has led some of the first major modern environmental legislation, the Clean Air Act 1956 the year Pollution began to draw public attention in the United States since the mid-1950 's and into the early 1970 's, when Congress passed the Noise Control Act, the Clean Air Act, the clean water Act and the national environmental policy Act.

Smog pollution in Taiwan
Severe pollution incidents has increased the consciousness. PCB dumping in the Hudson River as a result of the ban on the protection of the environment in its consumption of fish in 1974, long contamination with dioxins Love Canal starting in 1947 became national news in 1978 and the 1980 Superfund law has.