I explained how that invention necessitated the invention of the grandest water-moving system in the history of man. It was a system magnificently built, and it allowed us to erect two if not three world-class cities and the most intensive farming region in the world. But the system was now cracking, and it surely would not see us into a future of more houses, and more nuts, and the havocs of climate change teaming up with the havocs of our own nature: drought and flood, wildfire and mudslides.