Past emissions are estimated to involve some unavoidable warming (about a further 0.6°C by the end of the century relative to 1980-1999) even if atmospheric greenhouse gas concentrations remain at 2000 levels (see WGI AR4). There are some impacts for which adaptation is the only available and
Global mean annual temperature change relative to 1980-1999 (°C) 12 3 4
C02 stabilisation: TAR
SRES: AR4 WG 1 multiple sources B1 • B2 A1T
A1B • A2 • A1FI
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