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The term is most often used to refer to the modern period of global warming, an increase of {{temperature|0.8|1.4}} has been measured at weather stations throughout the world, since around 1850, when instrumental measurements began to be taken and organized records began to be kept. Although only a small increase in absolute terms, the temperature increase is unprecedented within at least the last 14,000 years according to the reconstructions by Viau et al. (2006) <ref>http://www.citeulike.org/user/kmcolo/article/618203 Viau et al. (2006) 'Millennial-scale temperature variations in North America during the Holocene' in Journal of Geophysical Research, 111</ref> and can have a significant impact upon the earth. 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.
The term is most often used to refer to the modern period of global warming, an increase of {{temperature|0.8|1.4}} has been measured at weather stations throughout the world, since around 1850, when instrumental measurements began to be taken and organized records began to be kept. Although only a small increase in absolute terms, the temperature increase is unprecedented within at least the last 14,000 years according to the reconstructions by Viau et al. (2006) <ref>http://www.citeulike.org/user/kmcolo/article/618203 Viau et al. (2006) 'Millennial-scale temperature variations in North America during the Holocene' in Journal of Geophysical Research, 111</ref> and can have a significant impact upon the earth. 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.
Although measurements have been made of the temperatures of other planets these are by no means thorough or comparable with the measurements used for earth. The short space of time over which measurements have been taken and the very limited spatial coverage means that reliable average figures have not been obtained. They have certainly not been taken extensively enough to produce a five year average temperature, which is the standard when determining temperature trends on earth.
==Controversy==
==Controversy==