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Food in the US has always been a bargain. Anything you want can be had at supermarkets.
Now with the increased cost of chemical fertilizers, fuel to produce and ship, prices have been rising rapidly over the last few years.
Taking acreage from food to grow corn for ethanol is also hurting as well as increasing phosphate run off, polluting the rivers all the way down to the Gulf.
A 20x20 garden can feed a family of five from May to October if you sucession crop one vegetable after another when mature. I used to get 3 different crops per row, but it takes alot of planning and work to get it to work. Worth it though.
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