Once, farmers and rural people knew how to prune hazel to foster abundance: both of edible nuts and of straight, strong, flexible rods for bridges, walls, and baskets. Townspeople felled their beeches to make charcoal to fuel ironworks. Shipwrights shaped oaks to make hulls. No place could prosper without its inhabitants knowing how to cut their trees so they would sprout again. Pruning the trees didn't destroy them. Rather, it created the...