climate change

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Across
  1. 3. The most common greenhouse gas
  2. 4. Collecting and reprocessing a resource so it can be used again
  3. 7. The process plants use to make food where they take carbon dioxide out of the atmosphere and give out oxygen
  4. 9. A type of fuel that was made under the ground millions of years ago
  5. 10. The adjustment or preparation of natural or human systems to a new or changing environment
  6. 12. When the carbon dioxide increases, the ________________ increases
  7. 13. A specific event or condition that happens over a period of hours or days
Down
  1. 1. Continually frozen ground that occurs when the temperature remains below 0 degrees for several years
  2. 2. The process of cutting down the forests
  3. 5. The release of a substance/gas into the atmosphere
  4. 6. The warmer periods between ice-ages
  5. 8. Refers to the average weather conditions over many years in a certain place
  6. 11. The greenhouse gas that comes from rotting rice and cows stomachs