The wealth of the nation is its air, water, soil, forests, minerals, rivers, lakes, oceans, scenic beauty, wildlife habitats and biodiversity... that's all there is. That's the whole economy. That's where all the economic activity and jobs come from. These biological systems are the sustaining wealth of the world.
Gaylord Nelson, Paul A. Wozniak, Susan M. Campbell (2002). “Beyond Earth Day: Fulfilling the Promise”, p.157, Univ of Wisconsin Press
