More importantly, it is now realised that the amount of energy going into food production amounts to much more than those miles. It now takes about 10 calories of energy - usually in the form of oil, to produce each calorie of food.
For more on Food & Farming Impacts: click
Land, Air, Water & Biodiversity
TASKS
Try this SF Quiz as to what you know about some of the main issues
Social
Food is a matter of life and death for everybody in the world. The 'social' element of sustainability requires us to consider the conditions of those producing food - both in the fields and the factories.
In the developed world we tend to take food for granted, yet with recent price rises, people are realsing that our "food security".is not what it should be. We have ony a few days supply of food, relying on long supply chains that could easily be cut.
Economic
Many people in these supply chains are poorly paid - either as small producers or wage labourers. Their conditions are often not well policed or protected. In the UK, farming is the most dangerous workplace in terms of being killed while at work.
There is a growing concessus that we in UK should be producing more food - particularly fruit and vegtables, locally. This would not only reduce dependence on imported food, it would provide for a healthier diet and encourage investment in local industry. The World Health Organisation (pdf p205-208) says:
"Fortunately, the strategies needed to create desired changes in nutritional and environmental patterns are often complementary and, as a whole, provide cost-effective, sustainable development for agricultural land. In addition, local strategies that seek to improve the availability of, access to and consumption of locally produced foods, particularly fruits and vegetables, also increase the interdependence and thus the social cohesion between urban and rural dwellers."
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DEVELOPING ENVIRONMENTAL AWARENESS 
