Environmental problems in the world

There are many problems which threaten our natural enviuronment. Acid rain, global warming and air and water pollution are among the most serious ones. Global warming, caused by an increase in the amount of carbon dioxide in the atmosphere, which will lead to significant changes in the Earth’s climate, was first predicted in 1960s. But at the time these predictions were regarded as science fiction.
Gases pollute the atmosphere because they are produced too quickly to be cleared away naturally by rain, winds or plant life. These poisonous gases come from several sources such as oil producers, industries which burn fuel and motor vehicles. When the gases are released they have two harmful effects. Firstly, some of the gases are caught by rain clouds and fall as acid rain, which damages the environment. Secondly, increasing amounts of carbon dioxide forms a cover over the earth, keeping the heat of the sun close to earth‘s surface just like a greenhouse keeps heat in. The increase in carbon dioxide is getting worse by cutting down of forest. Trees use carbon dioxide, and the fewer trees there are, the more of this gas remains in the air. The USA is now leading an international effort to limit deforestation. In 1996, Washington set goals for...

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