The Asian Development Bank (ADB) has been eager to work with the GEF since its pilot phase. Initially, its engagement was largely ad hoc through the three GEF Implementing Agencies. Based on this experience, it worked with other regional development banks so that they all obtained direct access as GEF Executing Agencies in 2002. We recognised that working together directly can achieve innovation and greater impact by blending GEF’s catalytic grant resources for the global environment with ADB financing for sustainable development.