Earth Day Crossword

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Across
  1. 4. Not harmful to the environment (10 letters).
  2. 7. Ensures resources for the future (11 letters).
  3. 8. Converts sunlight into energy (4 letters).
  4. 10. Pertaining to the entire world (6 letters).
  5. 11. Element crucial for greenhouse gas discussions (6 letters).
  6. 13. A tall, woody plant with branches and leaves (4 letters).
  7. 16. A colour associated with the enviorment (5 letters).
  8. 17. Stuff we throw away (5 letters).
  9. 18. Turns old items into new ones (9 letters).
Down
  1. 1. Animals and their habitats (11 letters).
  2. 2. Our home in the universe (5 letters).
  3. 3. Release of harmful substances (9 letters).
  4. 5. Keeping surroundings free from contaminants (5 letters).
  5. 6. Study of living things and their environment (6 letters).
  6. 8. Our blue home in space (6 letters).
  7. 9. Spreading knowledge about the environment (8 letters).
  8. 11. Long-term weather patterns (7 letters).
  9. 12. Like sunlight or wind power (8 letters).
  10. 14. Home to all living things (7 letters).
  11. 15. Shielding and preserving natural resources (8 letters).