pollution project in marathi language pdf
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Pollution project in marathi on water air and sound
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Pollution is the introduction of pollutants into the natural environment that cause adverse changes. Pollution can take the form of chemicals or energy, such as noise, heat or light. Pollutants, the components of pollution, can be strange substances / energies or natural pollutants. Pollution is often classified as a point source or contamination from non-point sources. In 2015, pollution killed 9 million people in the world.
Air pollution has always accompanied civilizations. Pollution began in prehistoric times when man created the first fires. According to a 1983 article in the journal Science, "soot" found in prehistoric cave roofs provides ample evidence of the high levels of contamination that were associated with inadequate ventilation of open fires. "The forge of metals seems to be a key turning point in the creation of significant levels of air pollution outside the home.The main samples of glaciers in Greenland indicate increases in pollution associated with the production of Greek, Roman and Chinese metals, but at that time the pollution was comparatively small and could be handled by nature.

Pollution has a cost. Manufacturing activities that cause air pollution impose health and cleaning costs on society as a whole, while the neighbors of an individual who chooses fireproof housing can benefit from a lower risk of a fire spreading to their homes. own houses. If there are external costs, such as pollution, the producer may choose to produce more product than would occur if the producer had to pay all associated environmental costs. Because the responsibility or consequence of the self-directed action lies partly outside the self, it is an element of externalisation. If there are external benefits, as in the case of public security, a lower amount of the good may be generated than in the case that the producer receives payment of external benefits to third parties.
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