The climate sensitivity due to CO2 is expressed as the temperature change in °C associated with a doubling of the concentration of carbon dioxide in Earth’s atmosphere ( the IPCC Fourth Assessment Report: from 280 to a concentration of 560 ppmv [ parts per million by volume ] ).
Scientists made numerous estimates of climate sensitivity over the last few decades and have yet to determine the correct value. The figure shows the change in published climate sensitivity measurements over the past 15 years.
GRAPH
FULL ARTICLE