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Line 5: − + − The existence of these climate cycles is often used as a contradiction of the theory of anthropogenic global warming, or man-made climate change.+ − − However, this argument does not stand up to scrutiny. It can be seen that the Earth is currently in the middle of a time of peak temperatures during which little or no warming should be expected. − − This contradicts the observed facts, which indicate ~0.76 degrees Celsius of warming (with error bounds of 0.2 degrees Celsius either way) over the past century and a half or so. − − Changes of such magnitude, when natural, normally take place over much longer time-scales. − − The theory of anthropogenic global warming states that greenhouse gas emissions since the Industrial Revolution have influenced global mean temperatures in a way that is outside the norm, particularly the rate of change of temperature. − − This is not to say that the current warming period could not be natural. − − However, such a theory is unsupported by the evidence.
Argument section should be under global warming article; putting in a "See Also" for global warming
However, whilst the variation over large time-scales is extreme (deviating from the long-term average by as much as ten degrees Celsius at a time), the changes are usually very gradual and take place over many millennia.
However, whilst the variation over large time-scales is extreme (deviating from the long-term average by as much as ten degrees Celsius at a time), the changes are usually very gradual and take place over many millennia.
==Argument against the theory of man-made global warming==
== See Also ==
* [[Global Warming]]
[[Category:Global Warming]]
[[Category:Global Warming]]