text: 11. Member countries of the ECE and the European Community are fully cognizant of their special responsibilities in relation to global environmental problems and are ready to take a lead in the effort toward~ solving those problems and to assist developing countries in their environmental and devel?pmental efforts. 12. We have agreed to the following policies, objectives, principles and commitments in support of sustainable development nationally, regionally and globally. II. THE ECONOMICS OF SUSTAINABILITY 13. Taking into account the symbiotic nature of economy and the environment: (a) To integrate environmental considerations with economic and sectoral planning .and policies and to encourage all relevant institutions to be accountable for evaluating environmental effects of their programmes and policies. , ... A/CONF.151/PC/1O English Page 20 (b) To develop sound national indicators for sustainable development to be taken account of in economic policy making. One of the ways to achieve this is to supplement national accounting systems in order to reflect as fully as possible the importance of natural resources as depletable or renewable economic assets. To this end we call upon the United Nations to accelerate its work on natural resource accounting and pollution control expenditures as production costs, and the Organisation for Economic Co-operation and Development (OECD) to intensify its work on economic indicators. To investigate the possibilities of changing the present forms of resource accounting in investment analysis in order to give greater emphasis to long-term sustainability compared with short-term considerations. (c) To make more extensive use of economic instruments in conjunction with a balanced mix of regulatory approaches in order to increase efficiency of environmental protection, of the use of natural resources and of energy consumption. Such instruments may include: taxes on environmentally damaging activities and products or energy inefficient products: reduction or, wherever possible, elimination of subsidies to resource-intensive or environmentally damaging activities; 
analysis: The text discusses the integration of environmental considerations with economic planning, the development of sustainable development indicators, and the use of economic instruments for environmental protection. These topics suggest that the document is focused on the relationship between the economy and the environment, with an aim to promote sustainable development.