I am currently doing a " Ecological Humanities" course that I am finding very interesting. Who are we as humans, and just a part of the whole system, to decide what is desirable and what not? This conflict often rears its head when gardening as I am only too aware - which insects are pests and which useful, when is a plant a weed or just growing where we do not want it etc. food for thought indeed and, I am not plagued by Opuntia!