Taking into account all 20 models, the spread of results reduces when the scientists looked at the rainfall changes per degree of global warming independent of the exact time path of the warming. (sciencedaily.com)
This relationship of CO2 to warming is usually called sensitivity, and is often expressed as the number of degrees of global warming that would result from a doubling in global CO2 concentrations. (climate-skeptic.com)
For example, a few degrees of global warming transformed the freezing conditions of the last ice age into our present mild climate. (climaterealityproject.org)