Even if the numbers on natural forcings change, the scope of the impact is minimal relative to human forcing.
Global Warming -- Research Issues
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These greenhouse gases reabsorb heat reflected from the Earth's surface, thus trapping the heat in our atmosphere. This natural process is essential for life on Earth because it plays an important role in regulating the Earth's temperature. However, over the last several hundred years, humans have been artificially increasing the concentration of these gases, mainly carbon dioxide and methane in the Earth's atmosphere. These gases build up and prevent additional thermal radiation from leaving the Earth, thereby trapping excess heat.
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For a thread about the supposed acquittal of CO
2, Turtle sure seems to be spending an awful lot of time trying to cast doubt on the models.
