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Short essay on water pollution in kannada

short essay on water pollution in kannada

of huge oceans, lakes, and rivers. People may be made aware about dangers created by water pollution so that they feel their responsibility and take steps in this direction. Scripps Institution of Oceanography: Investigating Ocean Pollution : Scripps scientists research the effects of pollution on marine life in San Diego Bay, California. Other examples of point source pollution include an oil spill from a tanker, a discharge from a smoke stack (factory chimney or someone pouring oil from their car down a drain. How do we know when water is polluted? Until the early 1990s, around 5 million tons of sewage was dumped by barge from New York City each year. Benton et al, Linnean Society of London, 1995. People have been abusing and misusing water since long. In other words, pollution is a necessary evil that people must put up with if they want to make progress. The Guardian, Prof Joan Rose, winner of the Stockholm Water Prize, sees great progress in tackling water-borne diseases, but acknowledges that the world is as polluted as ever. Pollution discharged by factories in one country with poor environmental standards can cause problems in neighboring nations, even when they have tougher laws and higher standards.

Environmental laws can make it tougher for people to pollute, but to be really effective they have to operate across national and international borders. Fortunately, not everyone agrees with this view. Human being needs water not only for drinking but also for cooking, washing, irrigation, fishing etc. At the opposite end of the spectrum are highly toxic chemicals such as polychlorinated biphenyls (PCBs).

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Dams built for hydroelectric power or water reservoirs can reduce the sediment flow. This is called nonpoint-source pollution. People who've grown tired of walking the world's polluted beaches often band together to organize community beach-cleaning sessions. Sewage discharged into coastal waters can wash up on beaches and cause a health hazard. Estimates of the marine animals killed in the spill vary from approximately 1000 sea otters and 34,000 birds to as many as 2800 sea otters and 250,000 sea birds. There are also two different ways in which pollution can occur. During construction work, soil, rock, and other fine powders sometimes enters nearby rivers in large quantities, causing it to become turbid (muddy or silted). Chlorine, potassium mood depression per-magnate and other bacteria preventing medicines may be inserted in drinking water sources from time to time so that they remain free from pollution. See for example "Norway fury at UK nuclear waste flood." by Paul Brown, The Guardian, December 20, 1997. In the Black Sea, an alien jellyfish called Mnemiopsis leidyi reduced fish stocks by 90 percent after arriving in ballast water.

Another way to measure water quality involves examining the fish, insects, and other invertebrates that the water will support. Notes and references Wherever possible, I've referenced my sources with links; the following notes (indicated by bracketed numbers in the text) are mostly references to books, journals, and other "offline" reports that can't be linked the same way. If the chemicals are dangerous or the concentrations are too great, we can regard the water as polluted. TV news footage of oil slicks filmed from helicopters flying overhead. However, another 271 billion is still needed to update and upgrade the system. Pollution: Earth in Danger by Helen Orme. (This is sometimes called ghost fishing.) About half of all the world's seabird species are known to have eaten plastic residues.

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