- 157 -quality, hlrve also been recogniraed in isetrumsnts adopted within the framework of the Conference on Security and Co-operation in Europe (CSCE). Finally the work of the World Commission on Environment and Developmant m/ and its Experts Qroup on Environmental Law uL2/ also emphasise that maintaining ecosystems and related ecological processes is essential to the achievement of sustainable development. m/ 1.For the purposes of the present draft articles, “pollution of an international watercourse [system]” means any detrimental alteration in the composition cc quality of the waters of an international watercourse [system] which results directly or indirectly from human conduct, fi/ !!I This paragraph which deals with the definition of pollution may be moved u3 to article 1 on [Use of terms]. L&p/Qur (1967). J.&uw, note 144, especially article 3, “Ecwyatems, relateil ecological processes, biological diversity, antA sustainability”, at p. 45, Ju.li.1 See, to the came effect, the Environmental Perspective to the Year 2000 and Beyond, e.g. parae. 2 and 3(d), adopted by the Qoverning Council of the United Nations Environment Programme (-&99rds of mS&-Iv. FormSeaeion.supalement. a, document A/42/25, annex II) and subsequently adopted by the General Assembly in resolution 421166 of 11 December 1967 “as a broad framework to guide national action and !nternational co-operation on policies and programmes aimed at achieving environmentally sound development”, Also to the same effect are certain provisions of the Constitution of the Republic of Namibia, which entered into force on 21 March 1990, including art. 91 (concerning fuctions of the Gnbudsmai 1, pare. (c), and art. 95 (concernhy “Promotion of the Welfare of the People”), pare. (1). According to the latter, for example, “The State shall actively promo’ie and maintain tho welfare of the people by adopting, j,&er alb, policies aimed at the following; . . . (1) maintenance of ecosystems, essential ecological processes
**Analysis**
The text discusses the definition of pollution of an international watercourse and its relationship to sustainable development, ecosystems, and ecological processes. It cites various international agreements, conferences, and national constitutions to emphasize the importance of maintaining ecosystems and related ecological processes for the achievement of sustainable development. This suggests that the text is primarily concerned with environmental issues.

**Category**
Natural resources and environment, International trade