Land use
Energy
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BIOFUEL
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ISOTOPES
KEROGEN
MAGMA
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MINERAL
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| M | E | C | R | U | O | S | E | R |
| I | N | A | N | K | B | I | E | E |
| N | W | M | E | L | I | S | L | M |
| E | O | G | G | E | O | O | A | O |
| R | D | A | O | U | M | T | R | V |
| A | T | M | R | F | A | O | U | A |
| L | L | C | E | O | S | P | T | L |
| B | E | A | K | I | S | E | A | X |
| S | M | T | F | B | N | S | N | P |
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