th paragraph The th paragraph is wrong   The black body temperature of the Earth is  C Since the Earth reflects about  of incoming sunlight in the absence of the greenhouse effect the planets mean temperature would be far lower  about  or  C  instead of the much higher current mean temperature about  C  The black body temperature of the Earth is  or  C not  C which is the temperature of an ideal blackbody the same distance from the Sun as the Earth It was correct before it was changed on Dec  Also reference  does not support that statement I suggest the following as a possible replacement paragraph and even as a possible first paragraph since it actually defines what Greenhouse Effect really refers to  If an ideal thermally conductive blackbody was the same distance from the Sun as the Earth it would have an expected blackbody temperature of  C However since the Earth reflects about NASA Earth Fact Sheet or Introduction to Atmospheric Chemistry by Daniel J Jacob Princeton University Press  Chapter  The Greenhouse Effect of the incoming sunlight the planets actual blackbody temperature is about  or  C Solar Radiation and the Earths Energy BalanceIntergovernmental Panel on Climate Change Fourth Assessment Report Chapter  Historical overview of climate change science page  about C below the actual surface temperature of about  C or  CThe elusive absolute surface air temperature see GISS discussion The mechanism that produces this difference between the actual temperature and the blackbody temperature is due to the atmosphere and is known as the Greenhouse Effect  Note that I also modified the expected temperature and albedo based on NASA data If the values in the current paragraph are used in Stephans equation C with no reflection is associated with C with  reflection and C with