noted that the topic dealt with a new field and obviouel:r many terme used in the articles were not widely known and ehould thoroforo be dofined. Conventions on related subjects all hacl long lists of tetme definecl. 486. Some members commented that the definition of the term "ectivitiea involving risk” in subparagraph (a) relied on four eoparate conceptor “dengerou6 substances”, “technologies that: produce haserdous radiation”, - 254 -“dangerous genetically altered organism” and 9langerous micro-organisms”. Any activity which was not related to one of those four elements even if, objectively speaking, it might be the cause of transboundary harm - for instance, the construction or operation of a dam - would apparently be excluded from the definition, and would not therefore be considered an activity involving risk. The definition should therefore be reconsidered. 487. It was also pointed out that the definition of “activities with harmful effects” wau perhaps narrowly construed and it was uncertain whether it also included the effects of activities which caused harm although the risk of harm was not anticipated. It was further mentioned that the relationship between this type of activities and article 2 should be clarified, since that article made no reference to such activities. As regards the term “traasboundary harm” in subparagraph (g), many members welcomecl the fact that that concept now included harm to the environment, as well as the cost of preventive measures taken to contain or minimise traneboundary harm. As regarc¶e the choice between the two qualifiers “appreciable” or “significant” to set the threshold for harm, many members preferred the expression “significant”. Ae regards the term “incident”, some members expressed preference for the expression “accident” in activities involving risk which they felt was more commonly used. As for the definition “restorative measures” in subparagraph (f),a comment wae made that the cost of such measures should
**Analysis**
The text appears to be discussing a specific topic related to environmental and international law, specifically the definition of terms used in a convention or treaty. The language used is technical and formal, and the topics being discussed are related to the potential harm caused by human activities to the environment and other countries.

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