A positive feedback the climate system itself has failed to display during many a big excursion of CO2 levels in the past, as well as in the present. (notrickszone.com)
My hypothesis continues to be that the post feedback climate sensitivity to CO2 number, expressed as degrees C per doubling of atmospheric CO2 concentrations, is greater than zero and less than one. (climate-skeptic.com)
It's also another piece of evidence that is consistent with fast feedback climate sensitivity of around 0.75 °C / W / m ². (realclimate.org)