Environmental issues

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Across
  1. 6. eye disease of the lens causing partial or total blindness
  2. 8. a system of living beings in the sea each feeding on the one below it
  3. 12. a building complex to generate e.g. electricity
  4. 14. can be replaced with sth new of the same kind
  5. 15. power supply
  6. 16. greatly reduce the size, volume of something
Down
  1. 1. substance produced while making sth else
  2. 2. agricultural waste is used as a fuel or energy source
  3. 3. a type of a non-renewable energy resource
  4. 4. substance consisting of two or more chemical elements
  5. 5. generating a lot of debate
  6. 7. produced in connection with low and high tide
  7. 9. splitting of the nucleus of an atom
  8. 10. energy from the hot water and steam in the Earth
  9. 11. protect sth by covering it with a material against loss of e.g. heat
  10. 13. where hydrogen is combined with oxygen to produce heat and electricity