United States

Environmental accounting---the modification of the national income accounts to take into consideration the economic role of the environment---has grown in importance over the past ten years. However, many countries have not yet implemented such accounts, and there is much controversy about whether and how to do so.

The family Cracidae is made up of 50 species of guans, curassows and chachalacas - large gregarious game birds, many of which have striking colours. They are important as seed dispersers, biological indicators of the environment, a major protein source for indigenous people, and for ecotourism. Nearly half the species in the family are threatened and several have been pushed to near extinction by wide-spread destruction of tropical forets and over-harvesting.

This magnificient publication vividly portrays the beauty and grandeur of World Heritages Sites in North America - where the ideas of national parks, wilderness preservation and the World Heritage Convention began.

Found in a variety of forms and sometimes with very attractive flowers, cacti and other succulents have elicited widespread interest and tremendous popularity worldwide. Although the subject of a certain amount of debate, about 10,000 species of plant are recognised as belonging to the succulent group. Of these, an estimated 2,000 are threatened with global extinction in the wild and many more are regionally or nationally threatened.