After the Seventh Day: The World Man Created

acres agriculture aircraft already America ancient animals Arctic Asia atomic ayllu Aztecs became become biotic potential Britain building Byblos canals Carthage cent century B.C. China civilization climate countries crops cultivation culture desert developed disease earth East Egypt empire energy engineering Erech Eridu Eskimos Euphrates evidence experience farmers farming feet fertility fields fire fish floods forest grain Greece Greek heat Homo sapiens human hunting Inca India Indians Indus industrial irrigation islands jungle Lake land living locusts malaria materials means Mesopotamia metal methods migration miles minerals modern mosquitoes mountains Nabataeans nature Nile nomads peasants Persian Persian plateau plants plateau plow population primitive produce pyramids radioactive reactors region rice river rock Roman Sahara salt seeds silt slaves snow soil square miles stone Sumerian supply surface temple tion toolmaking trade tree tritium tsetse fly uranium Valley wealth wheel