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for introduction, earlier version was better; go into causation vs. correlation in the main article
As far back as temperature records can be reconstructed, periods of global warming and global cooling have alternated; see [[ice age]]s and [[interglacial warming]].
As far back as temperature records can be reconstructed, periods of global warming and global cooling have alternated; see [[ice age]]s and [[interglacial warming]].
In the modern period of global warming, a slight increase of {{temperature|0.8|1.4}} has been measured at weather stations throughout the world, since around 1850, when organized records began to be kept. Since this happens to correlate with increases in [[carbon dioxide]], many have speculated about a causal relationship, when in fact there is only a correlation at best. There is no completely proven model explaining the rise in global temperatures.
In the modern period of global warming, a slight increase of {{temperature|0.8|1.4}} has been measured at weather stations throughout the world, since around 1850, when organized records began to be kept. Since this happens to correlate with increases in [[carbon dioxide]], many have speculated about their possible relationship. Despite this, there is no completely proven model explaining the rise in global temperatures.
==Controversy==
==Controversy==