Long-term decline in grassland productivity driven by increasing dryness.

Nat Commun · 2015 · PMC4479003 · PMID 25972300

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an overall trendno p-value reported

Further, we found no evidence of an overall trend in Δ (that is, from increasing CO 2 ) in any treatment.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.