Global Warming is sometimes referred to as the greenhouse effect. The greenhouse effect is the absorption of energy radiated from the Earth's surface by carbon dioxide and water vapor, ozone (O3), as well as other gases. These certain gases that occur naturally in the atmosphere tend to trap the sun's heat, which is called global warming. By trapping in the sun's heat, the Earth can be warmed up. For the last 10,000 years, the Earth's climate has been beneficial to mankind. The natural greenhouse effect has kept the Earth's average surface temperature for life to exist.