Imagine a canal 10 meters deep, 100 meters wide, and 7.1 million kilometers long - long enough to encircle the globe 180 times. That is the amount of water it takes each year to produce food for today's 6.5 billion people. The projected increase of between 2 and 3 billion people over the next four decades would mean increasing the length of this canal by another few million kilometers to everyone fed. Even if there were resources and technology to do this - and that is itself debatable - it's unlikely that there would be sufficient fresh water to fill this extended canal.
A growing world population has led to rising demand for fresh water to ensure a growing supply of food and to meet rising nutrition demands. Where will this water come from? A new publication co-sponsored by CGIAR sheds some light on the narrowing options. Sudhirendar Sharma reviews the report....more