Trees can provide food, such as fruits, nuts, and leaves, or indirectly through the sale of products, so trees can be an efficient way to improve food security.”Working across field, farm and landscape scales, it is known that trees also play a key role in making efficient use of water and nutrients while maintaining soil carbon,” says FergusSinclair, Systems Science Leader at the World Agroforestry Center (ICRAF),”this also develops a climate smart agriculture through the intensification and diversification of farm production,in a manner that leads to increases in agricultural productivity. Further they can also have knock on effects within farm systems (many interactions in a system). For example instead of usingdung for fuel, farmers can alternatively use firewood as fuel and return the dung to farm as manure.”