i have compiled this diagram.
i had some space down the bottom so i drew a monkey but you should just ignore that, the science bit is further up. this came to me in a flash, much like when einstein was in his car and shouted 'eureka!'
i think if we just dont run out of the stuff at the bottom and we kill the thing at the top we should be okay. its clear to me now that nature can be classified as fish and not fish. im working on the global warming thing. just give me a few days. im gonna have to donate my brain to science. its selfish for me to keep it for myself.