Rifkin's 1980 book, "", discusses how the physical concept of entropy applies to nuclear and solar energy, urban decay, military activity, education, agriculture, health, economics, and politics. It was called "A comprehensive worldview" and "an appropriate successor to... "Silent Spring", "The Closing Circle", "The Limits to Growth", and "Small Is Beautiful"" by the "Minneapolis Tribune". Rifkin's work was heavily influenced by the ideas expressed by Nicholas Georgescu-Roegen in his 1971 book "The Entropy Law and the Economic Process". In Rifkin's 1989 revised edition of "Entropy:...", entitled "Entropy: Into the Greenhouse World", its "afterword" was written by Georgescu-Roegen.