We can see the main cause of global warming is greenhouse gases. Now let as talk about the cause of greenhouse gases in details. Greenhouse means hothouse for plants that need heat. But this is not only the cause of gases there are some greenhouse gases happen naturally in the atmosphere and some others caused by human activities such as burning of fossil fuel and coal. Greenhouse gases include water vapor, carbon dioxide, methane, nitrous oxide and ozone. These gases increase the temperature of the earth slightly; especially the increasing atmospheric CO2 is likely the most significant cause of the current warming.
In the the greenhouse link you can read more about greenhouse causes..
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