 Around the same time, the Stanford ecologists Paul and Anne Ehrlich warned in The Population Bomb (Ehrlich 1968) that the growth of human population threatened the viability of planetary life-support systems. The sense of environmental crisis stimulated by those and other popular works was intensified by NASA’s production and wide dissemination of a particularly potent image of Earth from space taken at Christmas 1968 and featured in the Scientific American in September 1970. Here, plain to see, was a living, shining planet voyaging through space and shared by all of humanity, a precious vessel vulnerable to pollution and to the overuse of its limited capacities. In 1972 a team of researchers at MIT led by Donella Meadows published the Limits to Growth study, a work that summed up in many ways the emerging concerns of the previous decade and the sense of vulnerability triggered by the view of the earth from space. In the commentary to the study, the researchers wrote: