Changes

==Natural Variability of the Climate System==

==Natural Variability of the Climate System==

Scientists who believe in global warming think that the Earth has experienced numerous [[Ice Age|ice age]]s over two million years, during which global temperatures dropped approximately {{temperature|6|11}} 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. It is often and possibly correctly argued by those such as Al Gore that artificial effects may compound with natural changes to produce a particularly dangerous temperature rise and that even if global warming is not wholly anthropogenic, humans may have the power to stop it.

Evolutionary scientists who believe in global warming think that the Earth has experienced numerous [[Ice Age|ice age]]s over two million years, during which global temperatures dropped approximately {{temperature|6|11}} 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.

==Natural Climate Change on Other Planets==

==Natural Climate Change on Other Planets==

Recently, it has also been found that similar to the Earth and Mars, [[Neptune]] is also undergoing global warming.  Measurements taken at the Lowell observatory in [[Arizona]] have shown an increase in Neptune's brightness and temperature since 1980 following the same pattern seen on Earth and Mars.  The researchers who discovered this warming suggest there may be a correlation between the warming and solar variations.<ref>http://www.agu.org/pubs/crossref/2007.../2006GL028764.shtml</ref>

Recently, it has also been found that similar to the Earth and Mars, [[Neptune]] is also undergoing global warming.  Measurements taken at the Lowell observatory in [[Arizona]] have shown an increase in Neptune's brightness and temperature since 1980 following the same pattern seen on Earth and Mars.  The researchers who discovered this warming suggest there may be a correlation between the warming and solar variations.<ref>http://www.agu.org/pubs/crossref/2007.../2006GL028764.shtml</ref>

[[Pluto]] has also been found to be undergoing global warming.  The overall temperature increase on Pluto has been greater than that on the earth. Pluto's highly ovular orbit may be the cause of this. <ref>http://www.space.com/scienceastronomy/pluto_warming_021009.html</ref>

[[Pluto]] has also been found to be undergoing global warming.  The overall temperature increase on Pluto has been greater than that on the earth.<ref>http://www.space.com/scienceastronomy/pluto_warming_021009.html</ref>

On the other hand [[Uranus]] has had no net change in temperature since 1977.  A rapid increase in temperature reversed itself.  The reasons for this are not understood.<ref>http://www.boulder.swri.edu/~layoung/eprint/ur149/Young2001Uranus.pdf</ref>

On the other hand [[Uranus]] has had no net change in temperature since 1977.  A rapid increase in temperature reversed itself.  The reasons for this are not understood.<ref>http://www.boulder.swri.edu/~layoung/eprint/ur149/Young2001Uranus.pdf</ref>

'Global Warming Now World's Most Boring Topic’ <ref>http://newsbusters.org/node/14167</ref>

'Global Warming Now World's Most Boring Topic’ <ref>http://newsbusters.org/node/14167</ref>

Global Warming has become a popular issue. <ref name="cato" />

The need to fight "global warming" has become part of the dogma of the liberal conscience. <ref name="cato" />

Clearly, "global warming" is a tempting issue for many very important groups to exploit.  

Clearly, "global warming" is a tempting issue for many very important groups to exploit.