The World Agroforestry Centre (ICRAF) aims to build on what farmers already know and do. By combining scientific excellence with innovative development partnerships, the World Agroforestry Centre is delivering science to farmers and policy debates. Its mission is to use science to generate knowledge about the complex role of trees in agricultural systems and their effects on livelihoods and the environment, and foster use of the knowledge to influence decisions and practices that impact the poor. In the area of REDD in Vietnam, ICRAF is working on REDD+ opportunity costs and research and technical support to the government, including on payment schemes. For example, work carried out by ICRAF in Dak Nong Province found that the main direct driver of deforestation is the conversion of natural forest to industrial perennial crops and its interaction with shifting cultivation in acquiring land.