of the climate system is unequivocal, as is now
evident from observations of increases in global average
air and ocean temperatures, widespread melting of snow
and ice and rising global average sea level (Figure 1.1). {WGI
3.2, 4.8, 5.2, 5.5, SPM}
Eleven of the last twelve years (1995-2006) rank among the
twelve warmest years in the instrumental record of global surface
temperature (since 1850
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