trustme.bro/r/…
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the claim
The vast majority of carbon in a plant originates from atmospheric carbon dioxide rather than soil
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
no sources on either side

The vast majority of plant dry mass originates from carbon dioxide fixed from the atmosphere via photosynthesis, making this statement a matter of common scientific knowledge that requires no specific paper citation.

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The analysis

The claim that the vast majority of carbon in a plant originates from atmospheric CO2 rather than soil nutrients is a fundamental, textbook biological fact. Photosynthesis builds plant biomass primarily from air and water, with soil providing essential minerals and water rather than the bulk of the structural carbon. Pursuant to Step 0 instructions, trivially true everyday observations and foundational scientific definitions are classified as COMMON_KNOWLEDGE, requiring no papers and yielding empty index arrays.

Everything we examined (12)
  1. Global trends of tree-ring carbon isotope discrimination under rising atmospheric CO2 and changing climatepeer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. The carbon isotope composition of the fossil conifer Frenelopsis as a proxy for reconstructing Cretaceous atmospheric CO2peer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Tracing Soil CO2 Fluxes under Drying-Rewetting Cycles: Isotopic Insights from an Automatic Soil Incubation System.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. Microbial characterization during composting of biowaste.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  5. Early or late? The role of genotype phenology in determining wheat response to drought under future high atmospheric CO2 levels.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. Soil denitrification potential and its influence on N2O reduction and N2O isotopomer ratios.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Increasing thermal drying temperature of biosolids reduced nitrogen mineralisation and soil N2O emissions.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. Tracing CO2 sources in urban and rural areas characterized by different land-use patterns using carbon isotopes.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. Revival of the biological sunlight-to-biogas energy conversion system.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Will carbon isotope discrimination be useful as a tool for analysing the functional response of barley plants to salinity under the future atmospheric CO₂ conditions?peer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. Carbon isotope discrimination and bundle sheath leakiness in three C(4) subtypes grown under variable nitrogen, water and atmospheric CO(2) supply.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. Evolution of an intermediate C4 photosynthesis in the non-foliar tissues of the Poaceae.peer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → COMMON KNOWLEDGE · 9505 Aug 2026
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