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Time series of annual and 5 year mean surface air (2 m) temperatures for a control simulation (black) with constant (1870) forcing, and 3 experiments: increasing greenhouse gases only (green); increasing greenhouse gases and sulphate aerosols (blue); and increasing greenhouse gases and sulphate aerosols plus a reconstruction of the variability of the solar irradiance (red). The observed temperatures since 1850 are also show (cyan).