(iii) Sustainable energy use; (iv) The economics of sustainability. 11. It was also decided that relevant North-South aspects should be dealt with under each main theme. (vi) National Reports 12. In response to the first element of the mandate for the Conference, each ECE Government was invited to submit a report on the national follow-up to the WCED report within the four selected policy areas. Governments were encouraged to prepare the report in co-operation with major non-governmental sectors in their country. (vii) Synthesis Document 13. On the basis of 22 national reports received by the end of September 1989, the ECE secretaria t prepared a synthesis document which was used as an input in the subsequent preparatory meetings for the Conference. A revised version was prepared in April 1990 on the basis of 26 national re~orts received, and served as an official Conference document. / ... A/CONF .151/PC/10 . English Page 5 (viii) Preparatory Committee 14. An open-ended Preparatory Committee composed largely of representatives of Ministries of Environment and/or Foreign Affairs of ECE Governments met twice. 15. At its 1st meeting in Bergen from 6 to 8 September 1989, the Committee agreed on the four main themes and key events, dates, location and sequence of preparatory meetings. The ECE was represented and participated in the meeting. The Committee elected a Bureau with Ambassador Martin Huslid of Norway as Chairman. 16. The Committee also accepted the basic concept of the Conference itself, which, in the spirit of the World Commission, was designed to stimulate cross-sectoral dialogue between public authorities with different responsibilities, as well as to foster alliance-building between public authorities and non-governmental groups. 17. Thus, the Committee decided that five selected non-governmental sectors should be invited to take part both in the preparations for and in the Conference itself, 
**Analysis**
The text discusses the preparation of a conference on sustainable development, focusing on sustainable energy use, the economics of sustainability, and national reports on the follow-up to a previous report. This suggests that the conference is concerned with the relationship between economic development and environmental protection.

**Category**
Natural resources and environment, Economic development