Earth and Human Activity

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Across
  1. 4. prevention of wasteful use of a resource
  2. 6. using an object or resource material again for either the same purpose or another purpose without changing the object's structure in a significant way
  3. 8. the total mass of organisms in a given area or volume
  4. 10. the natural world, as a whole or in a particular geographical area, especially as affected by human activity
Down
  1. 1. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects
  2. 2. material that is not wanted; the unusable remains or byproducts of something
  3. 3. convert (waste) into reusable material
  4. 5. matter used as a fuel, especially in a power station for the generation of electricity
  5. 7. the ability to maintain or support a process continuously over time
  6. 9. the capacity to do work
  7. 11. make smaller or less in amount, degree, or size