Since humans populated the earth, they have caused a devastating effect on the natural environment. In the past, the earth's air has been polluted, many forests have been destroyed and thousands of animals have become extinct. Air pollution has become a major problem since the first machines were made. Each year industrial developed countries generate billions of tones of pollutants. The major pollutants are: carbon monoxide, sulfur dioxide, nitrogen dioxide, ozone, lead, particles and volatile …showed first 75 words of 354 total…

…showed last 75 words of 354 total…and for human sports, such as hunting. All of the world creatures play a role in the circle of life and we must ensure that the circle is not broken. There are many reasons why the earth is being treated carelessly. Air pollution has a major role as well as deforestation. These two reasons help cause animals to become endangered or extinct. Shown by these facts, humans have caused a devastating effect on the environment.