Permaculture focuses on trees as the coming food source for the world.  And- the Florida citrus industry is collapsing (again).  An Evolutionary Ecologist who has bred trees for 40 years explains why YOU need to understand some genetics; why the word "hybrid" means 4 different things, or nothing at all; shows examples from his 3 tree crops; why the most expensive thing you can do is plant cheap trees; discusses how small growers can work to maintain, and improve, genetic diversity (without setting invasive species loose...), and how YOU can bring new species into the food crop mix.   Support the show at permaculturevoices.com/support