the 1950s, ecology was transformed by the social and political pressures of the early 1970s. Ecologists became the guardians of the human relationship to nature. James Moore describes how people try to get Darwin on the side of their view of nature. In The Origin of Species nature is seen as being at war, but also likened to a web of complex relations. Here, Darwin gave people a basis for urging humans not to take control of nature but to cooperate with it. In popular imagination, a scientific theory has a single fixed meaning, but in reality it becomes cultural property, and is usable by different interested parties. Twenty years later, the story of DDT continues with a press conference announcing the halting of construction in a skyscraper due to a nesting peregrine falcon being found there. Ornithologist David Berger criticises the event for helping to foster the myth of the sensitivity of nature. Joan Halifax talks about ecology as a gift to human beings and all species, a moral lesson that gave rise not to utopia, but ecotopia. Politics professor Langdon Winner theorises that social ideals are being read back to us as if they were lessons derived from science itself. The scientific notions of the 1950s, the ideas of endless possibilities for exploitations of nature, are now seen as ill-conceived. And the ideas of ecology today may in 30 or 40 years seem similarly ill-conceived. The episode ends with a quote from Darwin about seeking divine providence in nature. "I feel most deeply that the whole subject is too profound for the human intellect. A dog might as well speculate on the mind of Newton. Let each man hope and believe what he can." Contributors Prof. Robert Metcalf, entomologist, National Defense Research Committee 1943–46 Harry Renken, farmer Wilbert Joyce, farmer Shirley Briggs, biologist, US Fish and Wildlife Service 1945–48 Lillard Heddon, crop sprayer 1945–83 Dr Eugene Kenega, research entomologist, Dow Chemical 1940–82 Dr Thomas Jukes, research chemist, American Cyanamid Company 1945–63 James Moore, biographer of Charles Darwin J. Gordon Edwards, entomologist Lorri Otto, resident of Milwaukee suburb Carol Yannacone Victor Yannacone Daniel Berger, ornithologist, University of Wisconsin 1965–68 Dr Hugh Iltis, ecologist, University of Wisconsin 1968 Langdon Winner, historian of science Joan Halifax, The Ojai Foundation Part 5. 'Black Power' The penultimate episode, originally broadcast on 9 July 1992, looks at how Kwame Nkrumah, the leader of the