As what I have read in the encyclopedia, “Air and water are essential to life on Earth. Human activity, can sometimes damage their purity and make them polluted or dirty.”
Air Pollution:
Air is considered to be polluted when it contains enough harmful impurities to affect the health, safety, or comfort of living things. The term pollution, usually means damage to the environment caused by human activity. Vehicles such as cars and airplanes give out exhaust fumes. Factories burn fossil fuels, such as coal, and chemicals, and release waste matter into the air.
When people use fossil fuels such as gasoline, oil, and coal, carbon dioxide and other gases are released into the air. These gases act like the glass in a greenhouse which traps the heat from the sun. This “greenhouse effect” causes the atmosphere to warm and world temperatures continue to rise.
Water pollution:
Water just like air is polluted when it contains harmful impurities that affect living things. Pollution of water can also have natural causes. Storms can cause soil and other debris to dissolve in water. But, as with air pollution, human activity causes the most damage to water supplies. Factories release harmful chemicals into rivers and lakes. Sewage which is the household waste from toilets, sinks and bathtubs, pumps into the oceans. If an oil tanker sinks, thousands of tons of oil can cover the surface of the sea and the shore. As a result, fish, birds and other wildlife die. Waste material on land can also pollute groundwater because groundwater contains soil and rocks. Dangerous material can pass into the food cycle through crops or animal feed.
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