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| 003 | 200721 | ||
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| 100 | _aKluger, Jeffrey | ||
| 245 | 0 | _aChallenges we face | |
| 300 | _a28 - 34 | ||
| 500 | _aLos retos a los que el mundo se debe enfrentar en materia ecologica. | ||
| 562 | _e0 | ||
| 650 | _aECOLOGÍA | ||
| 773 |
_085402 _aTime - Vol.160 No.9 |
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