the environment

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Across
  1. 4. /a gas that's released when carbon is burned(for example coal or oil).
  2. 6. /global changes in temperature, mainly caused by the burning of fossil fuels.
  3. 7. /a thick dirty cloud a ground level caused by pollutants reacting to sunlight.
  4. 8. /the complex system of relationships between living things and their environment.
Down
  1. 1. /a place in which a species normally lives.
  2. 2. /to make something mew from materials that have been used before.
  3. 3. /to use more than necessary, or to use inefficiently.
  4. 5. /to keep something in its original state.