In the final part of our series, Mark Doyle investigates the potential consequences of environmental pressures and rising populations on the global food supply.
He also looks at another new challenge, the advent of Biofuels.
With most of this supposedly "green" fuel coming from crops that would otherwise go towards feeding people or livestock, some experts are anticipating a major supply crunch as the oil companies start to compete for agricultural land.
By some estimates, half of the US corn harvest could be diverted towards bioethanol distilleries within the next two years, causing global prices of grains to spiral, and leaving many food-importing regions like North Africa and the Middle East suddenly struggling for their staples.
What are the long-term solutions if we are to combat the upcoming challenges?
How does the growing of biofuel affect the supply of food?
To find out more: Go to
http://news.bbc.co.uk/2/hi/programmes/documentary_archive/6501077.stm
and download the podcast
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