Across
- 3. Rev Farming method that led to high crop yields, but also environmental damage
- 5. formation Pollutants trapped near the Earth's surface by heat
- 11. acidification The rising acidity of oceans due to CO₂ absorption
- 12. Engineered crops with modified DNA
- 17. The process by which land becomes desert
- 18. A process that removes salt from seawater
- 20. The spread of cities and loss of natural land
Down
- 1. Fishing practice that leads to species depletion
- 2. Wastewater treatment that makes water safe again
- 4. The increasing number of people on Earth
- 6. Farming practice of growing one crop over large areas
- 7. warming The human-caused increase in Earth's temperature
- 8. pollution Contamination of land by human activities
- 9. Harmful substances entering water bodies
- 10. A gas that contributes to smog and acid rain
- 13. Extracting minerals from the earth
- 14. A gas that contributes to the greenhouse effect
- 15. pollution Harmful substances in the air
- 16. The process of clearing trees without replanting them
- 19. layer The thinning of a protective atmospheric layer