With reference to 'Global Environment Facility', which of the following statements is/are correct?

The Global Environment Facility (GEF) is a multilateral financial mechanism that provides grants to developing countries and countries with economies in transition for projects related to biodiversity, climate change, international waters, land degradation, ozone layer, and persistent organic pollutants. Its primary role is to fund projects that address global environmental challenges.

Option A correctly states that GEF serves as a financial mechanism for the 'Convention on Biological Diversity' (CBD) and the 'United Nations Framework Convention on Climate Change' (UNFCCC). It also serves other conventions like the Stockholm Convention on Persistent Organic Pollutants, the Minamata Convention on Mercury, and the UN Convention to Combat Desertification.

Option B is incorrect because GEF's main function is providing funding, not undertaking scientific research at a global level itself, though it funds projects that may include research components.

Option C is incorrect. While GEF facilitates transfer of funds, it is an independent financial entity, not solely an agency under the OECD (Organisation for Economic Co-operation and Development).

Thus, option A is the most accurate description of GEF's role among the given choices.