The term "lower atmosphere" refers to the part of the Earth's atmosphere that is closer to the surface. It includes the air we breathe and where most weather phenomena occur. Full definition
Which, in turn, pumps warm lower atmosphere air into the upper atmosphere, where the IR path to space is far shorter. (climate-skeptic.com)
However there has been a vigorous debate about whether the increase in lower atmosphere temperatures has slowed down. (theguardian.com)
And adding more CO2 to the atmosphere in the short - term triggered even more energy loss from the surface and lower atmosphere there, the team's climate simulations suggest. (sciencemag.org)