Increased food production is one of the triumphs of modern technology. Packaged peas and fish fingers abound in our supermarkets. Modern fishing methods bring in record catches from Korea to King's Lynn. The Green Revolution increases four-fold the food production of the Third World, relieving hunger and averting disaster.

In this third programme John Percival argues the other side of the picture: the way poor countries like Ghana and Ceylon are forced into a precarious dependence on imported machinery, pesticides and fertilisers, the way poor fishermen lose out in competition with high-powered trawlers.