Global Warming :)

During its long history, the climate of the Earth has changed dramatically many times. But now the world faces a serious problem, because changes are taking place that do not seem to be the result of natural processes. Scientists believe that these changes are a result of the way we live. In this essay I will write the definition of global warming. Also I’m going to explain some causes and effects of this problem.

First of all, global warming is the increase in the average temperature of the Earth's near-surface air and oceans since the mid-twentieth century and its projected continuation.

The first cause and is the greenhouse gases. The earth’s surface soaks up the sun’s heat.
Some of this heat then escapes back into space, but some of it is absorbed by gases such as carbon dioxide and water vapour in the atmosphere. The second cause is too much carbon dioxide. We are putting more and more carbon dioxide into the atmosphere by burning more and more fossil fuels (coal, oil and natural gas), and by clearing huge areas of forest. Forests are especially important to us because trees, like other green plants, take carbon dioxide from the air when they make their food by the process called photosynthesis.
The main effect of the extra pollution is that our Earth is warming up.

The problem began more than 100 years ago when people began to use petrol and oil on a large scale. Many scientists now believe that the average global temperature will be at least 1 degree Celsius warmer by the year 2030. The next effect of this problem is that some British scientists have discovered that spring is starting earlier each year. Some trees now open their leaves ten days earlier than they did 40 years ago.

In conclusion, I think people should realize the global warming is a very serious problem and it increases year after year. So we should try so hard to reduce this problem because we just have one planet and if we lose it will be everybody’s loss.