A person, thus, is led to consider that the Earth's atmosphere convects heat away from the surface through this continuous process, vertically upward, as the MOST EFFECTIVE form of heat transfer in the gaseous Earth atmosphere. (hubpages.com)
It turns out that the mantle convects in a very chaotic manner, but with length scales on the order of 1,000 kilometers, instead of the 10,000 kilometers that had been predicted. (thescienceexplorer.com)
Only the surface layer which does not convect has its temperature raised by increased CO2. (realclimate.org)