Food right under your feet

Within just a few square feet in my back yard are multiple, edible plants.  There have been no poisons added, no genetic modification, no fertilization.  They grow here and are available to feed me.  We talk about biodiversity in places that are far away from us and fret over destruction of rain forests.  We might look at ourselves first.  Ever wonder how the native people survived without a grocery store?  Their world was the grocery store and it is still here and will be for a long time if we choose to protect it.  We might consider not poisoning our yards and instead eat what is there.