Sunday, September 11, 2011

Global warming

Global warming is the continues rise of the temperature of Earth's atmosphere and oceans. What causes global warming? Global warming is caused by the increasing amount of greenhouse gases trapped in the Earth's atmosphere.
The greenhouse gases are caused by human activities such as work in industries and deforestation. The greenhouse gases consists of water vapour, carbon dioxide, methane, nitrous oxide and ozone. This greenhouse gases trap heat which cannot escape from the Earth's atmosphere that easily. That is why we do not die of cold. However, due to too much human activities, too much of these greenhouse gases are being produced and trapped in the Earths' atmosphere. As a result, the Earth's temperature is rising continuously.
Many human activities have caused this to happen. Deforestation has caused many trees to be chopped down. As trees take in carbon dioxide during photosynthesis, the carbon dioxide level in the atmosphere is controlled. However, trees are being chopped down, and at the same time, carbon dioxide is constantly being produced, there is a lack of tress to absorb the carbon dioxide.
What has global warming caused? It has caused many animals to die. Some very common examples include the polar bears which lives on the North pole. In years to come, it will cause certain species of animals to face extinction.
It is important to save the Earth now or it would be too late.

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