If our climate was dominated by positive feedbacks, it would have saturated to a runaway greenhouse state long ago. (wattsupwiththat.com)
This forcing would not produce the extreme Venus - like baked - crust greenhouse state, which can not be reached until the ocean is lost to space. (rsta.royalsocietypublishing.org)
Analyses performed by co-author Vera Dobos show that planets d and e are the most likely to be habitable due to their moderate surface temperatures, modest amounts of tidal heating, and because their heat fluxes are low enough to avoid entering a runaway greenhouse state. (astrobio.net)