Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Mar 10, 2012
To maintain their own food supplies, some of the wealthiest and most powerful countries in the world are acquiring large tracts of land from the poorest countries in the world. In this revealing clip, David Attenborough explores how to sustain an increasing world population. Thought provoking clip from the BBC's flagship science series Horizon.