Assertion Supported AI assessment confidence: 98% certainty 4/5 debate potential 1/5

Chay: Soil holds more carbon than atmosphere and terrestrial biomass combined

Freya Chay · The dirt on soil carbon credits · Aug 25, 2022 · at 3:53

CarbonPlan's Freya Chay explains the science behind soil carbon sequestration and why agricultural soils are a critical carbon reservoir.

0:00 / 0:08exact quote · 8.8s

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“Soil carbon is a huge carbon reservoir. It holds more carbon than the atmosphere, more carbon than all the terrestrial biomass combined”

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The claim, plainly

Soil holds more carbon than Earth's atmosphere and all terrestrial biomass combined.

a quote alone can be ambiguous, so this restates it with the references and context of the conversation around it resolved. AI-written; the tape below the player is the source.

Assessment

Major scientific consensus assessments, including the IPCC Sixth Assessment Report (2021), the Food and Agriculture Organization (FAO), and the Global Carbon Project, confirm that global soil carbon stocks substantially exceed the combined carbon stored in Earth's atmosphere and terrestrial biomass. Contemporary estimates place atmospheric carbon at ~870 GtC and terrestrial living vegetation biomass at ~450 to 650 GtC, yielding a combined total of ~1,320 to 1,520 GtC. In comparison, soil organic carbon (SOC) in the top 1 meter alone holds ~1,500 GtC, and total soil carbon (accounting for deeper horizons, permafrost, and soil inorganic carbon) ranges from ~2,500 to >3,000 GtC.

IPCC Sixth Assessment Report (AR6, WG I, Chapter 5, 2021) estimates global atmospheric carbon at ~870 GtC and terrestrial vegetation at ~450–650 GtC (combined total of ~1,320–1,520 GtC).
FAO Status of the World's Soil Resources and consensus scientific literature report total soil carbon stocks at ~2,500 to >3,000 GtC (with top 1m SOC alone at ~1,500 GtC), exceeding combined atmospheric and terrestrial biomass pools.

Checked against

[1] everycrsreport.com [2] usda.gov [3] mdpi.com [4] chathamhouse.org [5] preprints.org [6] soil4climate.org [7] imde.ac.cn [8] nih.gov

"IPCC AR6" "soil organic carbon" "vegetation" "atmosphere" "PgC" "stocks" "IPCC" "Figure 5.12" OR "Figure 6.1" "soil" "atmosphere" "vegetation" GtC OR PgC IPCC carbon cycle carbon pools soil atmosphere vegetation biomass GtC global carbon budget soil organic carbon vs atmosphere biomass soil carbon stock vs atmosphere and vegetation biomass combined IPCC "soil contains more carbon than the atmosphere and" vegetation biomass combined IPCC

assessed as of 2026-09-02

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Mentioned

atmosphere soil carbon terrestrial biomass

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Chay: Soil holds more carbon than atmosphere and terrestrial biomass combined

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