| 23422 | For the environment, affluence and technology matter as much as population size [Dobson] |
| 23423 | We currently value the present fourteen times more highly than the future [Dobson] |
| 23425 | Ecologism says growth must be reduced, and efficiency is not enough [Dobson] |
| 23430 | A million years is a proper unit of political time [Dobson] |
| 22881 | Should we value environmental systems for human benefit, or for their own sake? [Hildebrand] |
| 20993 | Eradicating smallpox does not impoverish nature [Sen] |