Environmental action

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Across
  1. 4. a word for "very often"
  2. 6. another word for the "contamination" of water or air
  3. 7. to take unfair advantage of e.g. workers --> to ...
  4. 8. the concept of keeping ecological balance
Down
  1. 1. cars needing petrol have a...
  2. 2. oil and gas are ...
  3. 3. another word for "trash" or "rubbish"
  4. 5. your carbon ... shows how much CO2 emissions you cause