As Rob Carlson of the University of Washington points out, if money is to be made selling products made from exhaust gas, then that gas goes from being waste matter to being a valuable resource.

正像华盛顿大学的罗伯·卡尔森所指出的那样，如果出售废气可以赚钱，那么，这些气体就会由废物变为有价值的资源。