The emissions of CO<sub>2</sub> and other volatiles from the world's subaerial volcanoes.

Sci Rep · 2019 · PMC6904619 · PMID 31822683

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possibly significantno p-value reported

We note that many papers treating CO 2 degassing from volcanoes also include a non-quantified (but possibly significant) fraction of CO 2 from background-biogenic sources present.

also in 649 other papers

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.