waste not want not

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Across
  1. 9. (noun) - : The power derived from physical or chemical resources, especially to provide light and heat or to work machines.)
  2. 10. (noun) - : Reduction in the number or quantity of something.)
  3. 12. (noun) - : A biological community of interacting organisms and their physical environment.)
  4. 14. (adjective) - : Able to be maintained at a certain rate or level.)
  5. 15. (noun) - : A measure of human impact on the environment.)
Down
  1. 1. (noun) - : The variety of life in the world or in a particular habitat or ecosystem.)
  2. 2. (noun) - : The process of growing or improving.)
  3. 3. (noun) - : A supply of something useful.)
  4. 4. (noun) - : The weather conditions prevailing in an area in general or over a long period.)
  5. 5. (noun) - : Gases released into the atmosphere.)
  6. 6. (noun) - : The protection of natural resources.)
  7. 7. (adjective) -: Able to be replenished naturally.)
  8. 8. (noun) - : Converting waste into reusable material.)
  9. 11. (noun) - : The presence of harmful substances in the environment.)
  10. 13. (noun) - : Unwanted or unusable materials.)