{
  "name": "Atmospheric oxygen then and now, and the size of the largest fossil insects",
  "desc": "Oxygen levels as stated by open sources (today's dry air, model agreement on the Permo-Carboniferous peak, one revised model, a charcoal proxy), fossil insect size from an abstract, and the peak-to-today ratio computed for this page, one claim per row.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "Ants, Cells & Atoms",
  "url": "https://antscellsandatoms.com/insects/how-insects-breathe/",
  "from": [
    "Krause et al. 2018, Nature Communications 9:4081",
    "Somerville & Proctor 2013, BMC Microbiology 13:9",
    "Clapham & Karr 2012, PNAS 109:10927, abstract"
  ],
  "how": "Compiled by Ants, Cells & Atoms from the data listed",
  "data_by": [
    "Krause AJ et al. 2018, Nature Communications 9:4081, CC BY 4.0, https://doi.org/10.1038/s41467-018-06383-y, retrieved 2026-10-24",
    "Somerville GA, Proctor RA 2013, BMC Microbiology 13:9, CC BY 2.0, https://doi.org/10.1186/1471-2180-13-9, retrieved 2026-10-24",
    "Clapham ME, Karr JA 2012, PNAS 109(27):10927-10930, https://doi.org/10.1073/pnas.1204026109 (abstract), retrieved 2026-10-24"
  ]
}