Anglų esė. In the 21st century, we encounter a lot of negative effects to the environment because of our activity. Global warming is one of the most worrying problems. First of all, many trees are cut, so carbon dioxide cannot be absorbed. Trees are necessary for clean atmosphere.Second, people still build a lot of new fossil fuel power stations. Facilities like power stations throw away hazardous gases to the atmosphere and pollute the air. The excessive use of cars, trucks and other automotive viehicles also largely contribute to this.