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  1. 3. Relating to something that can be chosen instead of something else.
  2. 5. An oil platform and all the machines and equipment used on it.
  3. 7. An area of land around large cities where no buildings are allowed in order to protect the countryside.
  4. 8. Gases ejected from an engine as waste products.
  5. 11. An amount of money that the government or another organization pays to help to reduce the cost of a product or service.
  6. 12. The slow increase in the temperature of the Earth caused partly by the greenhouse effect increasing the amount of carbon dioxide in the atmosphere.
  7. 13. Relating to or being a commodity or resource, such as solar energy or firewood, that is inexhaustible or replaceable by new growth.
  8. 15. illegally catching or killing an animal, bird, or fish on someone else’s property.
  9. 16. Gases, such as CO2 that stop heat from escaping from the atmosphere and causes the greenhouse effect.
  10. 17. One of a series of very tall metal structures used for holding the wires that carry electric power high above the ground.
  11. 19. Relating to a plant or animal that has had its genetic structure changed in order to make it more suitable for a particular purpose.
  12. 21. The substance on the surface of the Earth in which plants grow.
  13. 23. The process of removing the trees from an area of land.
  14. 24. The production of immunity to an infectious disease in an individual through inoculation or vaccination.
  15. 25. The process of changing waste materials such as newspapers and bottles so that they can be used again.
  1. 1. A farm on which chickens and sometimes calves are kept very close together in small boxes.
  2. 2. Natural or chemical substances added to soil in order to help plants grow.
  3. 4. Chemicals used for killing insects, especially those that damage crops.
  4. 6. Fuels such as coal or oil, made from decayed material from animals or plants that lived many thousands of years ago.
  5. 9. People who want to protect the environment.
  6. 10. The fact of being able to provide everything you need for yourself, especially food, without buying from or being helped by others.
  7. 14. The process by which the surface of land or rock is gradually damaged by water, wind etc. and begins to disappear.
  8. 18. The process of making something dirty, polluted, or poisonous by adding a chemical, waste, or infection.
  9. 20. Supplying dry land with water by means of ditches etc.
  10. 22. Rain containing a high level of acid that can damage the environment. It is caused by pollution in the air.