Carbon and Energy Security

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Across
  1. 3. Planting trees in places with recent tree cover, replacing lost primary forests.
  2. 4. _____________ circulation.
  3. 6. The route taken by any form of energy from its source to its point of consumption (6,7).
  4. 8. _____________ turnover. The rate at which carbon enters and leaves a store.
  5. 11. 1,000,000,000,000 kilograms.
  6. 12. Any change from a natural ecosystem to an alternative use; it usually reduces carbon and water stores (4,10).
  7. 14. Natural gas trapped in fine-grained sedimentary rocks.
  8. 15. Organic matter used as a fuel.
  9. 17. Country which pioneered the use of biofuels.
  10. 18. The processes operating in oceans to circulate and store carbon.
Down
  1. 1. A fuel derived from living matter.
  2. 2. A new geological era beginning 8,000 years ago when humans began farming. Reflects the view that humans are the main driver of Earth's processes.
  3. 5. Processes and actions associated with human activity.
  4. 7. An abrupt change in an ecological state (8,9)
  5. 9. The leading international organisation for the scientific assessment of climate change (acronym).
  6. 10. Planting trees on land that has never had forest.
  7. 13. Name of Dr Gleave's cat
  8. 16. A mixture of clay, sand, water and bitumen (3,5).