Taken as a whole, the forest resources of the world, especially if regarded in terms of available land, are still abundant enough to supply services and goods in ample quantity. The problem of forest productivity is how to make this great, versatile and renewable resource serve man to a fuller extent, to something at least approaching its real capacity. For economic expansion, increasing populations and rising living standards will make high demands on the forest for goods and services, demands that cannot be met with forests producing only a fraction of their potentialities.