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Transient climate response

The global-average temperature change at the time of CO2 doubling (Year 70) in a model experiment in which CO2 concentrations increase at the rate of 1% per year.

In detail

The transient climate response is the change in the global surface temperature, averaged over a 20-year period, centred at the time of atmospheric carbon dioxide doubling, that is, at year 70 in a 1% per year carbon dioxide increase experiment with a global coupled climate model. It is a measure of the strength and rapidity of the surface temperature response to greenhouse gas forcing.