Global Climate Change.

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Across
  1. 3. a colorless, odorless gas produced by burning carbon and organic compounds and by respiration.
  2. 4. comes from cows
  3. 5. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
  4. 7. the weather conditions prevailing in an area in general or over a long period.
  5. 8. a change in global or regional climate patterns.
  6. 10. the envelope of gases surrounding the earth or another planet.
Down
  1. 1. a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants.
  2. 2. a gas that contributes to the greenhouse effect by absorbing infrared radiation, e.g., carbon dioxide and chlorofluorocarbons.
  3. 6. the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.
  4. 9. the production and discharge of something, especially gas or radiation.