Environment

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Across
  1. 3. /the increased levels of atmospheric carbon dioxide produced by the use of fossil fuels
  2. 4. / not depleted when used
  3. 5. / the color between blue and yellow in the spectrum
  4. 6. / able to be maintained at a certain rate or level
  5. 7. / can be used again after they have been treated using a special industrial process
Down
  1. 1. being decomposed by bacteria or other living organisms
  2. 2. / not harmful to the environment