Overall, will increase temp when everything else is constant. (climatestate.com)
«Law of particle dynamics of granular gases: Increasing temps in cooling systems.» (sciencedaily.com)
Further, as stated many times by others, CO2 sensitivity is log, thus, we will have to reach 1000 ppm to increase the temp by 2C, and even there, the probability of the actual temp metric reaching that point is, IMO, very low, because nature does have feedbacks. (wattsupwiththat.com)