"The solar heat possesses... the power of crossing an atmosphere; but, when the heat is absorbed by the planet, it is so changed in quality that the rays emanating from the planet cannot get with the same freedom back into space. Thus, the atmosphere admits of the entrance of the solar heat, but checks its exit; and the result is a tendency to accumulate heat at the surface of the planet." -John Tyndall, 1859
http://www.manhattanrarebooks-science.com/tyndall.htm Harry
