We have always had land in which the agricultural productivity is limited because there is not enough moisture. Systems of farming and burning often degrade dryland further until it is desert. Today,
Drylands are a sizeable part of the world's potentially arable land. They vary from the hyper-arid regions of the classic deserts of Africa and Asia to the more common semi-arid and sub-humid areas th
It has always been thought that some level of pollution and waste is unavoidable in development projects. But no one has made much effort to quantify and assess the extent of this sort of damage. In t
