Figure — Left: IPCC stabilization scenarios for atmospheric CO₂. Right: Corresponding equilibrium changes in global mean temperature since pre-industrial times (central values plus uncertainty ranges from IPCC (1996a). Other greenhouse gases and aerosols combined have been assumed to add 1 W/m2. The dashed vertical lines denote (a) the estimated range of variability of the change between in global mean temperature during the past 1000 years and (b) the 2^oC temperature considered as a long run climate policy target by the European Union. A temperature increase by 5-7^oC corresponds to the sustained average change in global average surface temperature that takes place during the transition from an ice age to an interglacial. Source: Azar & Rodhe (1997).