PUZZLE DELBIL

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Across
  1. 1. WARMING Increase in Earth’s average temperature
  2. 7. Process where heat is trapped in the atmosphere
  3. 9. Renewable energy from the sun
Down
  1. 2. Layer of gases surrounding Earth
  2. 3. Also known as “laughing gas”
  3. 4. Gas produced by livestock and rice fields
  4. 5. Non-environmentally friendly energy source
  5. 6. Ozone-depleting compound
  6. 8. Main greenhouse gas from burning fossil fuels