WAVES as a means to implement the NCA commitment. The overall goal of the Global Partnership for Wealth Accounting and Valuation of Ecosystem Services (WAVES) is to support partner countries to achieve sustainable development by systematically integrating values for natural capital in their national accounts systems, and, through the national accounts, mainstream natural capital valuation in both macro-economic indicators that monitor development progress, and natural resource management. WAVES is being led by the World Bank in partnership with United Nations Development Program, the United Nations Environment Programme (UNEP) and other partners. The WAVES initiative is linked with the 50/50 National Capital Accounting Campaign announced during the Rio+20 Summit and signed by 62 countries and private partners, in that it supports the implementation of national account systems that integrate the valuation of natural capital. The key difference is that there is not yet a clear implementation strategy and funding source for the 50/50 NCA while a clear strategy and the funding are in place for the five WAVES pilot countries.