Adaptation will be necessary to address impacts resulting from the warming which is already unavoidable due to past emissions

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

450 ppm

550 ppm

650 ppm

750 ppm

SRES: AR4 WG 1 multiple sources B1 • B2 A1T

A1B • A2 • A1FI

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