The ecology movement has the same general characteristics of segmentary, polycentric, reticulate organization as such other movements as the Black Power movement and the Pentecostal movement. The diverse groups concerned with environmental issues can be arranged on a continuum from established and routinized to new and radical. These groups proliferated rapidly from about 1969-1972. There is considerable overlap between ecology groups and various 'counter-culture' segments. Common ideology concepts of the ecology movement are: doomsday theme, share guilt for environmental degradation, finite resources leading to a zero sum game, closed system and spaceship earth, need for recycling, need to control or limit growth, ecosystem and interdependence, need for significant change, and system change means lifestyle change.