Why is carbon dioxide a greenhouse gas?

CO2 is a greenhouse gas because it increases the temperature level of the earth in the same way the heat is generated inside the greenhouse where plants are grown. Greenhouses or glass houses trap the heat within thereby increasing the temperature within the glasshouse. In the same way, CO2 acts like a blanket in the earth atmosphere and carbon dioxide accounts for about 5 to 25% of all of the known affect of the greenhouse effect.

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