Green House Gasses And Effects

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Across
  1. 3. Expansion of _______ and towns.
  2. 4. By using ______ energy to heat and light homes and offices.
  3. 5. We should replace normal bulbs with ______ bulbs.
  4. 6. We should buy _______ efficient household appliances.
Down
  1. 1. Which layer lies between 20 to 40 km of the atmosphere.
  2. 2. This gas is produced by rearing cattle.
  3. 5. We should replace normal fuel with _______ fuel.