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