This strategy features in the framework of Agenda 21 as formulated at UNCED (Rio de Janeiro, 1992), now coordinated by the United Nations Commission on Sustainable Development and implemented through national and local authorities. One outcome of UNCED was the suggestion that in order for UNEP to perform all of its UN sustainable development functions, while retaining its role as the principal body within the UN system in the field of environment and taking into account the development aspects of environmental questions, it would require access to greater expertise and provision of adequate financial resources and it would require closer cooperation and collaboration with development and other relevant organs of the UN system. Furthermore, UNEP's regional offices should be strengthened without weakening its headquarters in Nairobi, and UNEP should take steps to reinforce and intensify its liaison and interaction with UNDP and the World Bank.