Greenhouse effect!

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Across
  1. 5. The absorbing heat from the atmosphere.
  2. 6. (O3) is highly reactive.
  3. 8. A energy of climate in warm/cool.
  4. 9. The carbon/methane traps heat.
Down
  1. 1. The waters gaseous state (H2O)
  2. 2. A global sea level rising.
  3. 3. (N2O) was caused by human activities.
  4. 4. (CO2) traps energy from space.
  5. 7. (CH4) of colorless natural gases.