Usage Note
Sostenible is invariable in gender (same form for un modelo sostenible and una energía sostenible) but changes for number: sostenibles. It is preferred over sustentable in Spain, while sustentable is more common in parts of Latin America. Collocates strongly with desarrollo (development) in environmental discourse.
Examples
"Necesitamos un turismo más sostenible."
Natural Translation
We need more sustainable tourism.

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