As we all know, global warming is that the temperature of the earth keeps increasing every year. Ice mountains keep melting and causing the sea level to rise, climate changes and so on. Yes, it is true that all these are happening right now. The temperature is rising with an average of 4 degree Celsius during 21st century. This is due to the increasing of greenhouse gases concentration which caused by the air pollution factors mentioned as well as deforestation, which causes the concentration of carbon dioxide in the atmosphere increased. Well, ultraviolet light that comes from the sun, some penetrated through the ozone layer and stays in the earth due to the greenhouse gases that prevented it from reflecting back to the space, which then causes the temperature of the earth rising every year.
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