I've done my research to find the main problems that are causing global warming, and I have reduced it to three problems.
The most important point is pollution. To explain, huge cloud of smokes that are caused from the factories. Side by side with greenhouses gases, both goes up to the atmosphere layer and they block the sun rays that want to leave the earth.
Another cause is the overpopulation. In just one generation the population was increased from 2.6 to 9.1 billion. More people need more energy which will lead to the emission of CO2.
Finally, the risen of sea level due to the melting of the north and south Antarctic, will affect the areas near the coasts.
To read about more causes use wikipedia:
http://en.wikipedia.org/wiki/Global_warming
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