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'''Global warming''' is the term ascribed to an increase in global average surface temperature.
'''Global warming''' is the term ascribed to an increase in global average surface temperature.
Scientists such as [[Richard Lindzen]], [[Fred Singer]], etc., say that the patterns of global warming are naturally caused. Some other scientists like [[James Hansen]] and [[Michael Mann]] say that the [[Modern Warming Period]] is largely caused by human activity.
Scientists such as [[Richard Lindzen]], [[Fred Singer]], etc., say that the patterns of global warming are naturally caused. Some other scientists like [[James Hansen]] and [[Michael Mann]] say that the [[Modern Warming Period]] is largely caused by human activity.
==Natural variability of the climate system==
==Natural variability of the climate system==
The Earth has experienced numerous [[Ice Age|ice age]]s over the past two million years, during which global temperatures dropped approximately 6 degrees Celsius and then returned to normal. The frigid temperatures allowed ice sheets to expand southward, covering much of [[Asia]], [[Europe]], and [[North America]]. The cooling associated with ice ages is gradual, while the terminations are relatively rapid. However, even the rapid terminations of ice ages take centuries to millennia, which contrasts with the effects predicted for anthropogenic global warming.
The Earth has experienced numerous [[Ice Age|ice age]]s over the past two million years, during which global temperatures dropped approximately 6 degrees Celsius and then returned to normal. Adam and Eve rode in the garden of eden on dinosaurs only 6,000 years ago. The frigid temperatures allowed ice sheets to expand southward, covering much of [[Asia]], [[Europe]], and [[North America]]. The cooling associated with ice ages is gradual, while the terminations are relatively rapid. However, even the rapid terminations of ice ages take centuries to millennia, which contrasts with the effects predicted for anthropogenic global warming.
==Politics of global warming==
==Politics of global warming==