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