![The global average surface temperature range for each year from 1861 to 2000 is shown by solid red …[Credits : Encyclopædia Britannica, Inc.]](http://media-2.web.britannica.com/eb-media/44/91944-004-CE9BCBE6.gif)
The global average surface temperature range for each year from 1861 to 2000 is shown by solid red bars, with the confidence range in the data for each year shown by thin whisker bars. The average change over time is shown by the solid curve.
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