Trends of global temperature from observations, the United Kingdom’s Hadley Centre Global Climate Model, and the Canadian Climate Center’s Global Climate Model. Trends have been smoothed to remove year-to-year high frequency variations.

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	Dette værk er offentlig ejendom fordi det er skabt af Amerikas Forenede Staters føderale regering, eller en person eller institution arbejdende for denne. Ifølge Titel 17, Kapitel 1, Sektion 105 af US Code er sådanne værker ikke omfattede af ophavsret. Note: Dette gælder kun for værker af den Føderale Regering og ikke for værker af de enkelte delstater, territorier, commonwealth, amt, kommune, eller anden subnational enhed.
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https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse

Source: http://energycommerce.house.gov/107/hearings/07252002Hearing676/Karl1142.htm archive copy at the Wayback Machine