including the provision of technical assistance, joint financing, the exchange of specific data and information ,and similar forms of joint participation and co-operation. To the same effect, see comment (b) to article X of the Helsinki Rules, Helsinki Rules, fbta., p. 499, m/The Conunissio*. recoqniaes that it may be regarded as somewhat awkward to speak of “harm . . . to the use of waters . . .‘I, but preferred not to use another expression (such asr for example, “interference with the use of the waters” ) , at least at the present stage of its work, since other expressions could raise doubts as to whether a uniPurm standard was being applied in the case of each illustration. The present wording leaves no doubt that the same standard -that of appreciable harm - is utilised in all illustrations. lLiu/ Such amenities may include, e.g. the use of a watercourse for recreational purposes or for tourism, - 163 -State6 is intended to encompass, in particular, matters of the latter kind. m/ It is thus broader than the concept of the “ecotiystem” of an international watercourse [system], which is the subject of article 22. (7) The final sentence of paragraph 2 requires watercourse States to “take steps to harmonise their policies@@ concerning the prevention, reduction and control of water pollution. This obligation, which is grounded in treaty practice J.$).g/ and which has a counterpart in the 1982 United Nations Convention on the Law of the Sea, 2441 addresses the problems that o%ten arise when States adopt divergent policies, or apply different standarda, concerning the pollution of international watercourse[s] [systems]. For example, if the standerds applied by watercourse State A are quite stringent, while those of watercourse State B are lees so, the less stringent standards of State R, if
**Analysis**
The text appears to focus on the management and conservation of international watercourses, discussing the provision of technical assistance, joint financing, and exchange of data and information among states. The language used is technical and refers to specific concepts related to water pollution and its prevention. This suggests that the text is related to the environment and natural resources.

**Category**
Natural resources and environment