A/RES/66/288 United Nations Conference on the Least Developed Countries, 29 as well as their respective means of implementation; (f) Encourage high-level system-wide participation of United Nations agencies, funds and programmes and invite to participate, as appropriate, other relevant multilateral financial and trade institutions and treaty bodies, within their respective mandates and in accordance with United Nations rules and provisions; (g) Improve cooperation and coordination within the United Nations system on sustainable development programmes and policies; (h) Promote transparency and implementation by further enhancing the consultative role and participation of major groups and other relevant stakeholders at the international level in order to better make use of their expertise, while retaining the intergovernmental nature of discussions; (i) Promote the sharing of best practices and experiences relating to the implementation of sustainable development and, on a voluntary basis, facilitate sharing of experiences, including successes, challenges and lessons learned; (j) Promote system-wide coherence and coordination of sustainable development policies; (k) Strengthen the science-policy interface through review of documentation, bringing together dispersed information and assessments, including in the form of a global sustainable development report, building on existing assessments; (l) Enhance evidence-based decision-making at all levels and contribute to strengthening ongoing capacity-building for data collection and analysis in developing countries. 86. We decide to launch an intergovernmental and open, transparent and inclusive negotiation process under the General Assembly to define the format and organizational aspects of the high-level forum, with the aim of convening the first high-level forum at the beginning of the sixty-eighth session of the Assembly. We will also consider the need for promoting intergenerational solidarity for the achievement of sustainable development, taking into account the needs of future generations, including by inviting the Secretary-General to present a report on this issue. C. Environmental pillar in the context of sustainable development 87. We reaffirm the need to strengthen international environmental governance within the context of the institutional framework for sustainable development in order to promote a balanced integration of the economic, social and environmental dimensions of sustainable development, as well as coordination within the United Nations system. 88. We are committed to strengthening the role of the United Nations Environment Programme as the leading global environmental authority that sets the global environmental agenda, promotes the coherent implementation of the environmental dimension of sustainable development within the United Nations system and serves as an authoritative advocate for the global environment. We reaffirm General Assembly resolution 2997 (XXVII) of 15 December 1972 establishing the United _______________ 29 Report of the Fourth United Nations Conference on the Least Developed Countries, Istanbul, Turkey, 9–13 May 2011 (A/CONF.219/7), chaps. I and II. 17