World's wealthy buy up overseas farms

As a growing population stresses the world's food and water supplies, corporations and investors in wealthy countries are buying up foreign farmland and the freshwater perks that come with it.

From Sudan to Indonesia, most of the land lies in poverty-stricken regions, so experts warn that this widespread purchasing could expand the gap between developed and developing countries.

The 'water grabbing' by corporations amounts to 454 billion cubic metres per year globally, according to a new study by environmental scientists. That's about five per cent of the water the world uses annually.