Environmental issues
Environmental issues
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CLIMATE
CONSERVATION
DEPLETION
ECOSYSTEMS
ENERGY
EXPLOIT
OZONE
POLLUTION
RENEWABLE
RESOURCES
WASTE
| M | Z | S | E | C | O | S | Y | S | T | E | M | S |
| D | A | P | X | L | V | O | E | M | N | Y | N | I |
| S | E | O | P | I | J | K | F | E | F | O | N | Q |
| E | L | A | L | M | Z | W | R | S | I | Z | C | J |
| E | B | S | O | A | Z | G | J | T | I | O | H | O |
| T | A | F | I | T | Y | E | A | P | E | N | W | P |
| S | W | A | T | E | P | V | Q | B | R | E | B | F |
| A | E | R | Q | I | R | I | E | A | T | N | G | G |
| W | N | V | D | E | P | L | E | T | I | O | N | O |
| F | E | A | S | O | Q | F | P | Q | C | D | E | L |
| V | R | N | R | K | B | O | L | T | T | M | Z | F |
| P | O | L | L | U | T | I | O | N | S | Y | R | A |
| C | H | E | R | E | S | O | U | R | C | E | S | F |
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