Across
- 3. Co-author of "The Limits to Growth"
- 5. Environmental lawyer
- 6. Sierra Club president
- 9. Ecologist known for ecosystem studies
- 10. Early conservationist, influenced 60s activism
- 12. Author of "A Sand County Almanac"
- 14. Environmental Protection Agency head
- 15. Sierra Club executive director
Down
- 1. Author of "The Monkey Wrench Gang"
- 2. Prominent biologist and activist
- 4. Co-founder of Greenpeace
- 7. Author of "Silent Spring"
- 8. Architect of geodesic dome
- 11. Founder of Earth Day
- 13. Author of "The Population Bomb"