Changes in global average surface temperature, global average sea level, and northern hemisphere snow cover

Key figure from the 2007 Intergovernmental Panel on Climate Change (IPCC) report that shows changes in global average surface temperature, global average sea level, and Northern Hemisphere snow cover from as far back as 1850.

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IPCC (Intergovernmental Panel on Climate Change) AR4 Synthesis Report

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For background on this figure, see it in the context of the IPCC AR4 Synthesis Report see http://www.ipcc.ch/publications_and_data/ar4/syr/en/spms1.html

Figure caption reads: Observed changes in (a) global average surface temperature; (b) global average sea level from tide gauge (blue) and satellite (red) data and (c) Northern Hemisphere snow cover for March-April. All differences are relative to corresponding averages for the period 1961-1990. Smoothed curves represent decadal averaged values, while circles show yearly values. The shaded areas are the uncertainty intervals estimated from a comprehensive analysis of known uncertainties (a and b) and from the time series (c).

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