We need to have an economy within the confines of nature. Never ending growth, GDP, just can't happen. I shall look at the 20th C. as our tutorial on limits of what we can do: naively and blindly, as we've done, and keep doing, with fossil fuels, what we can do working with Nature and each other, as Mohammed Yunis does, as in micro loans, recycling, with our eyes open to effect, - how terrible we can be, as in WWI & WWII, how pigheaded, as in Vietnam, Iraq, Afghanistan. I wonder if we can see it as a great revelation of how to proceed for the future. We've already tipped the balance in global warming/carbon footprint, so we know that we can't fool, definitely can't fool around with, Mother Nature. It's just self deception. WE are Mother Nature. WE are not separate, and we are no more important than the snail darter we eradicated, the dodo, the passenger pigeon, the Lord God bird, we're just more important to us , but hey, the Horse Nebula doesn't even know we exist. And the Honey Badger don't give a shit...