All animals and plants feed off other species, and are also sources of nutrients for others. If all industries could be organized into "food chains," forming their own "ecosystems" in which the waste products of each are used as raw materials by others, this would go a long way towards solving the problem of waste disposal.
如果把所有產業串成食物鍊，自成一個生態系，自家的原物料來自其他產業的廢棄物，所產生的廢棄物又是其他產業的原物料，廢棄物的問題就解決一大半了。