# North America’s oldest boreal trees are more efficient water users due to increased [CO <sub>2</sub> ], but do not grow faster

> Research article (Proceedings of the National Academy of Sciences, 2019) · cited 96× · AI/ML

**Wikidata**: [openalex:W2914694191](https://www.wikidata.org/wiki/openalex:W2914694191)  
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