document.json

{
  "title": "Climate Science: Emissions, Equations, and the Carbon Cycle",
  "doc_type": "textbook chapter",
  "summary": "A textbook page introducing greenhouse-gas emissions by sector, a worked algebra example (the quadratic formula), and a schematic of the carbon cycle. The figures pair quantitative data with conceptual diagrams to connect measurement, mathematics, and Earth-system flows.",
  "language": "en",
  "figures": [
    {
      "id": "fig-1",
      "number": 1,
      "page": 1,
      "kind": "chart",
      "short_alt": "Bar chart: global CO2 emissions by sector, 2020 — Energy 73%, Agriculture 18%, Industry 5%, Waste 3%.",
      "long_description": "Bar chart titled 'Global CO2 Emissions by Sector, 2020'. It compares four sectors, showing that energy dominates emissions. From largest to smallest: Energy 73%, Agriculture 18%, Industry 5%, and Waste 3%. The energy bar is roughly four times the height of agriculture and dwarfs the industry and waste bars. The takeaway: decarbonizing energy production is by far the highest-leverage lever for reducing emissions.",
      "data_table": {
        "caption": "Global CO2 emissions by sector, 2020 (percent of total)",
        "columns": [
          "Sector",
          "Percentage"
        ],
        "rows": [
          [
            "Energy",
            "73"
          ],
          [
            "Agriculture",
            "18"
          ],
          [
            "Industry",
            "5"
          ],
          [
            "Waste",
            "3"
          ]
        ]
      },
      "equation_latex": null,
      "mathml": null,
      "on_figure_text": "Global CO2 Emissions by Sector, 2020 | Energy 73% | Agriculture 18% | Industry 5% | Waste 3%",
      "caption": "Figure 1. Global CO2 emissions by sector, 2020.",
      "provenance": "on_figure",
      "confidence": 0.9,
      "needs_human_review": false
    },
    {
      "id": "fig-2",
      "number": 2,
      "page": 1,
      "kind": "equation",
      "short_alt": "Equation: the quadratic formula, x equals negative b plus or minus the square root of b squared minus 4ac, all over 2a.",
      "long_description": "The quadratic formula, used to solve any equation of the form a x squared plus b x plus c equals zero. It states that x equals negative b, plus or minus the square root of the quantity b squared minus four a c, all divided by two a. The plus-or-minus sign yields the equation's two roots; the expression under the square root (the discriminant, b squared minus four a c) determines whether the roots are real and distinct, real and repeated, or complex.",
      "data_table": null,
      "equation_latex": "x = \\frac{-b \\pm \\sqrt{b^2-4ac}}{2a}",
      "mathml": "<math xmlns=\"http://www.w3.org/1998/Math/MathML\" display=\"block\"><mi>x</mi><mo>=</mo><mfrac><mrow><mo>&#x2212;</mo><mi>b</mi><mo>&#x00B1;</mo><msqrt><msup><mi>b</mi><mn>2</mn></msup><mo>&#x2212;</mo><mn>4</mn><mi>a</mi><mi>c</mi></msqrt></mrow><mrow><mn>2</mn><mi>a</mi></mrow></mfrac></math>",
      "on_figure_text": "x = (-b ± √(b² - 4ac)) / 2a",
      "caption": "Equation 2.1. The quadratic formula.",
      "provenance": "on_figure",
      "confidence": 0.95,
      "needs_human_review": false
    },
    {
      "id": "fig-3",
      "number": 3,
      "page": 1,
      "kind": "diagram",
      "short_alt": "Flow diagram of the carbon cycle: carbon exchange between atmosphere, oceans, land, and fossil reserves.",
      "long_description": "Schematic of the carbon cycle showing how carbon moves between four reservoirs — the atmosphere, the oceans, the land biosphere, and fossil reserves. Arrows depict the major fluxes: photosynthesis draws carbon from the atmosphere into plants; respiration and decomposition return it; oceans absorb and release CO2; and fossil-fuel combustion transfers stored carbon to the atmosphere. The per-arrow flux magnitudes printed on the diagram were not legible in the source scan and are left unread rather than guessed.",
      "data_table": {
        "caption": "Annual carbon fluxes labeled on the diagram (gigatonnes of carbon per year)",
        "columns": [
          "Process",
          "Flux (GtC/yr)"
        ],
        "rows": [
          [
            "Photosynthesis",
            null
          ],
          [
            "Respiration and decomposition",
            null
          ],
          [
            "Fossil-fuel combustion",
            null
          ]
        ]
      },
      "equation_latex": null,
      "mathml": null,
      "on_figure_text": "Atmosphere | Oceans | Land biosphere | Fossil reserves | Photosynthesis | Respiration | Combustion",
      "caption": "Figure 2. The carbon cycle.",
      "provenance": "on_figure",
      "confidence": 0.5,
      "needs_human_review": true
    }
  ],
  "reading_order": [
    "fig-1",
    "fig-2",
    "fig-3"
  ],
  "accessibility_notes": [
    "fig-1: the bar chart encodes sectors by colour only; the reconstructed data table restores the values for non-colour access.",
    "fig-3: flux values printed on the diagram were illegible in the source and are left null — flagged for human review rather than guessed."
  ],
  "confidence": 0.85,
  "warnings": [],
  "id": "example-legible-001",
  "source": {
    "type": "upload",
    "url": null,
    "platform": "mock",
    "title": "Sample Textbook Chapter — Climate Science",
    "author": "Legible Demo Press",
    "page_count": 1,
    "thumbnail_url": null
  },
  "model_used": "gemma-4-31b-it",
  "generated_at": "2026-07-11T00:00:00Z",
  "processing": {
    "vision": "qwen-vl (cuda)",
    "synthesizer": "fireworks-gemma:gemma-4-31b-it",
    "device": "cuda",
    "gpu_name": "AMD Instinct MI300X",
    "rocm_version": "6.4.0",
    "pages_rasterized": 1,
    "figures_analyzed": 3,
    "elapsed_seconds": 4.2
  }
}