Our planet is under siege. Assaults on the atmosphere -the greenhouse effect, the depletion of the ozone layer and increasing air pollution - pose a still- unquantified threat to human life. The dumping of hazardous wastes, and land- based sources of pollution, present a similar threat to the oceans. On land we are destroying a tropical forest the size of Austria every year, and more than a hundred species of wild plants and animals are lost forever each day. When the General Assembly of the United Nations established UNEP it charged us with reporting on the changing state of the world's...