Environmental issues

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Across
  1. 3. The name given to gasses that trap heat and cause global warming.
  2. 5. A tool used to illustrate how much impact a human being has on the Earth.
  3. 6. The most toxic greenhouse gas emission. It is common around landfills and farms.
  4. 8. The most abundant element in the universe. It can be used as a fuel source.
  5. 10. energy Energy that can be used and reused an infinite number of times.
  6. 11. The most efficient form of transportation in terms of energy usage. It does not pollute.
Down
  1. 1. These plentiful and useful organisms consume carbon dioxide, convert it to food, and produce oxygen.
  2. 2. The most abundant energy source capable of being harnessed by humans.
  3. 4. Living within the limits of earth’s natural resources.
  4. 7. An interdependent community of organisms including plants, animals, water, air and the ground.
  5. 9. The part of the earth’s atmosphere that repels the sun’s ultraviolet rays.