Britain may have only 100 harvests left due to over-intensive farming, according to research by Sheffield University scientists.
Farming methods have depleted the soil of the nutrients needed to grow crops, and the situation will get worse unless dramatic action is taken, they say.
At the same time, lack of bio-diversity is causing a dramatic fall in wildlife populations in this country, a report says.
In order to ensure future generations are able to grow fruit and vegetables, Britain should start to see towns and cities as potential farmyards, says the study by Dr Jill Edmundson.
Her research found that soils under Britain’s allotments were significantly healthier than soils that had been intensively farmed, with more organic carbon.