Secrets of the Forest In 1942 Allan R Holmberg, a doctoral student in anthropology from Yale University, USA, ventured deep into the jungle of Bolivian Amazonia and searched out an isolated band of Siriono Indians. The Siriono, Holmberg later wrote, led a "strikingly backward" existence. Their villages were little more than clusters of thatched huts. Life itself was a continuing and punishing search for food: some families grew manioc and other starchy crops in small garden plots cleared from the forest, while other members of the tribe scoured the country for small and promising fish holes. When local resources became depleted, the tribe moved on. As for technology, Holmberg Noted, the Siriono "may be classified among the most handicapped peoples of the world". Other than bows arrows and crude digging sticks, they only tools the Siriono seemed to possess were "two machetes (大砍刀) worn to the size of pocket-knives". Amazonian as unable to sustain complex societies Although the lives of the Sirono have changed in the intervening decades, the image of them as Stone Age relics has endured. Indeed, in many respects the Siriono sum up the popular conception of life in Amazonia. To casual observers, as well as to influential natural scientists and regional planners, the flourishing forests of Amazonia seem ageless, unconquerable, a habitat totally hostile to human civilization. The apparent simplicity of Indian ways of life has been judged an evolutionary adaptation to forest ecology, living proof mat Amazonia could not-and cannot-sustain a more complex society. Archaeological traces of far more elaborate cultures have been dismissed as the ruins of invaders from outside the region, abandoned to decay in the uncompromising tropical environment. Recent evidence The popular conception of Amazonia and its native residents would be enormously consequential if it were true. But the human history of Amazonia in the past 11, 000 years betrays that view as myth. Evidence gathered in recent years from anthropology and archaeology indicates that the region has supported a series of indigenous (本土的) cultures for eleven thousand years; an extensive network of complex societies-some with populations perhaps as large as 100, 000-thrived there for more than 1, 000 years before the arrival of Europeans. (Indeed, some contemporary tribes, including the Siriono, still live among the earthworks of earlier cultures). Far from being evolutionarily retarded, prehistoric Amazonian people developed technologies and cultures that were advanced for their time. If the lives of Indians today seem "primitive", the appearance is not the result of some environmental adaptation or ecological barrier; rather it is a comparatively recent adaptation to centuries of economic and political pressure. Investigators who argue otherwise have unwittingly projected the present onto the past. The evidence for a revised view of Amazonia will take many people by surprise. Ecologists have assumed that tropical ecosystems were shaped entirely by natural forces and they have focused their research on habitats they believe have escaped human influence. But as the University of Florida ecologist, Peter Feinsinger, has noted, an approach that leaves people out of the equation is no longer capable of being maintained in argument. The archaeological evidence shows that the natural history of Amazonia is to a surprising extent tied to the activities of its prehistoric inhabitants. The role of recent technology in ecological research in Amazonia The realization comes none too soon. In June 1992, political and environmental leaders from across the world met in Rio de Janeiro to discuss how developing countries can advance their economies without destroying their natural resources. The challenge is especially difficult in Amazonia. Because the tropical forest has been depicted as ecologically unfit for large-scale human occupation, some environmentalists have opposed development of any kind. Ironically, one major casualty of that extreme position has been the environment itself. While policy makers struggle to define and implement appropriate legislation, development of the most destructive kind has continued apace over vast areas. The other major casualty of the "naturalism" of environmental scientists has been the indigenous Amazonians, whose habits of hunting, fishing, and slash-and-burn cultivation often have been represented as harmful to the habitat. In the clash between environmentalists and developers, the Indians, whose presence is in fact crucial to the survival of the forest, have suffered the most. The new understanding of the pre-history of Amazonia, however, points toward a middle ground. Archaeology makes clear that with wise management selected parts of the region could support more people than anyone thought before. The long-buried past, it seems, offers hope for the future. There are lessons to be learned from similar ecosystems in other parts of the world.