Our modern industrial economy traces a straight line from resource extraction to manufacturing to sales to waste disposal. Since Earth has finite resources and limited ability to absorb pollution, the straight-line economy is unsustainable; it is designed for eventual failure.

Why not make the economy circular, with waste from one process feeding into other production processes, thus dramatically reducing the need both for resource extraction and for the dumping of rubbish? We should mimic nature: it’s a central ideal of the ecology movement, with roots in indigenous wisdom worldwide.