Pollution cause effect essay

According to the World Health Organization (WHO), air pollution is one of the world's biggest killers: it causes around three million people to die prematurely each year. Many of these deaths happen in developing countries (over half a million in India alone), but wealthier industrial nations suffer too: in the United States, for example, around 41,000 people a year are estimated to die early because of air pollution. Imagine how much media coverage there would be if several million people (that's roughly the population of Houston, Texas or the West Midlands conurbation in England) were killed in a terrorist incident or an earthquake . Because air pollution kills quietly and relentlessly, and its finger is hard to detect on the trigger, people barely seem to notice—or care.

PM affects more people than any other pollutant. The major components of PM are sulfate, nitrates, ammonia, sodium chloride, black carbon, mineral dust and water. It consists of a complex mixture of solid and liquid particles of organic and inorganic substances suspended in the air. The most health-damaging particles are those with a diameter of 10 microns or less, (≤ PM 10 ), which can penetrate and lodge deep inside the lungs. Chronic exposure to particles contributes to the risk of developing cardiovascular and respiratory diseases, as well as of lung cancer.

Detergents are relatively mild substances. At the opposite end of the spectrum are highly toxic chemicals such as polychlorinated biphenyls (PCBs) . They were once widely used to manufacture electronic circuit boards , but their harmful effects have now been recognized and their use is highly restricted in many countries. Nevertheless, an estimated half million tons of PCBs were discharged into the environment during the 20th century. [9] In a classic example of transboundary pollution, traces of PCBs have even been found in birds and fish in the Arctic. They were carried there through the oceans, thousands of miles from where they originally entered the environment. Although PCBs are widely banned, their effects will be felt for many decades because they last a long time in the environment without breaking down.









See more related lessons here

Aquaculture
Climate Change
Ecosystems
Earth System
Food Waste
Forest Preservation
Genetic Engineering
Landforms
Natural Resources
Ocean Acidification
Overfishing
Ozone Depletion
Pollution
Renewable Energy
Waste Water
Water Scarcity
Waste and Recycling


Pollution cause effect essay

pollution cause effect essay









See more related lessons here

Aquaculture
Climate Change
Ecosystems
Earth System
Food Waste
Forest Preservation
Genetic Engineering
Landforms
Natural Resources
Ocean Acidification
Overfishing
Ozone Depletion
Pollution
Renewable Energy
Waste Water
Water Scarcity
Waste and Recycling


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