Changes in temperature, sea level and Northern Hemisphere snow cover
Source: Intergovernmental Panel on Climate Change, Plenary XXVII, Valencia, Spain, 12-17 November 2007. Synthesis Report, Page 31, figure SPM.3
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).