Seoul, Korea, 25 August 2010. Almost half the agricultural land in the world, about a billion hectares, has more than 10 percent tree cover, but there is still huge potential to increase the number of trees on farmland and improve their productivity. Incorporating trees within farming landscapes, or agroforestry, can increase soil fertility, raise and sustain yields, increase income through the sale of timber and other tree products, and produce fodder and fuelwood.