I believe that consumerism is partly to blame for parts of any food shortage crisis which may impact our lives.
I Live in a large city and would miss my McDonalds and high street supermarkets if they were not available but it would not be the end of my life. My opinion.
Where I live is a relatively wealthy part of China (a large city) yet many of the people who live around me (neighbouring neibourhoods) earn very little money and need to be resourceful. They don't need, like I do, to run into town for a KFC when theyre hungry.
What they do have the benefit of is ingenuity. A balcony of a tower block dwelling becomes a small vegetable patch and the complex it is built in will have free range chickens roaming around the grounds (meat and dairy). These people are not absolute peasants. They have plasma TVs and have cars and have a reasonable standard of life.
Some local taxi drivers I know can often be seen while off shift by the river side hunting carp or crayfish for dinner, while playing with a PSP. The elderly in most families, while caring for the children, will sit and knit clothes. Its not all about poverty for.
These people I mention here are all part of a modern civilization. They just arent sucked into a consumer lifestyle like I have been. They use the best aspects of modern living without having to rely on it to survive.
If supermarkets, restaurants and other places which sell food were to close now I would be screwed. These self-sustaining people would not.
Since the discussion is the cost of food Ill bring this back on topic.
I can only speak for what little I know about food supply, and that is about Asian markets mostly.
The Chinese are a huge producer of food products, a lot of these products are destine for foreign markets, not domestic, due to the abundance of fertile land in China and good stocks of food for the domestic market.
When the food is exported out of the country and then the stocks run low due to bad farming conditions the price raises for both domestic and foreign markets.
When a huge conglomerate purchases huge amounts of farm land which is used for one specific crop they force up the price of this product for their own gain.
So as I originally stated: Consumerism can be part to blame for any future food crisis/price hike.
Have a lot more Id like to chime in but Im hungry and off to Pizzahut.