“Exponential growth builds slowly at first, then faster and faster. Unless something redirects it, it hits a limit and crashes. A few cells of green scum doubling in number each day for many months on a pond can be almost unnoticeable until one day the scum covers a quarter of the pond, the next day half the pond, and the next day chokes the whole pond and kills its life. By the time the effects of exponential growth become clearly visible, it may be too late to do anything about it. If business as usual continues, this is the future for us humans, and it will be painful, violent, and immoral by any standards, since we will have known and allowed it to happen anyway.”