Environmental activists

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