We can be thankful to a friend for a few acres, or a little money; and yet for the freedom and command of the whole earth, and for the great benefits of our being, our life, health, and reason, we look upon ourselves as under no obligation.
- Lucius Annaeus Seneca
Sustainability means running the global environment - Earth Inc. - like a corporation: with depreciation, amortization and maintenance accounts. In other words, keeping the asset whole, rather than undermining your natural capital.
- Maurice Strong
The materials of wealth are in the earth, in the seas, and in their natural and unaided productions.
- Daniel Webster