Environment

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Across
  1. 2. equipment used to increase the quality of air released from factories
  2. 5. take trash and transform it into new products
  3. 6. the introduction of harmful materials into the environment
Down
  1. 1. warming the term used to describe the rising of the average temperature on Earth
  2. 3. causing to be extinguished
  3. 4. rubbish or waste
  4. 6. transportation buses, trains, and other forms of transport that are available to the public