The World Bank and other multilateral development banks (MDB) have come under increasing pressure to assess the environmental impacts of bank-sponsored projects. The U.S. Congress has required that U.S. participation be based on policies that encourage the banks to raise the priority of environmental protection in their operations and to address environmental impacts; however, major issues continue to revolve around the effectiveness of all the MDBs in promoting environmentally sustainable development. Additionally, increasing concern over global environmental problems led to the creation in 1990 of a new multilateral fund -- the Global Environment Facility (GEF) -- to fund environmental projects of global concern that were generally not being funded by the MDBs. The pilot phase of the GEF ended in December 1993, and participants are currently in the process of determining how, or if, it should function as a permanent entity.