The global warming is the increase in the average temperature of the earth. The main cause is the CO2, which come from the factories and cars. The CO2 makes the atmospheric layer thicker. As a result of that the sun radiation will go in the atmospheric layer and will hit the earth. Then, the radiation will not reflect and will go out of the atmospheric layer. Instead, the sun rays while the others will hit the atmospheric and reflect again to the earth. It has many effects, increasing in the average temperature and this means the ice will melt and the forests will be affected.
The global warming is a very dangerous problem and we have to think seriously about it. We have to reduce using any machine which makes a lot of CO2. We must start now.
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