{
  "version": "2026-09-18",
  "note": "Single source of truth for the impact calculator, the badge generator and the README. Change here, nowhere else. Sources and reasoning: README, 'The impact numbers'. reman_life_years is the conservative default; the shop sees five to fifteen.",
  "lb_per_sqft": 0.58,
  "sizes": {
    "3x5": {
      "label": "3' x 5'",
      "sqft": 15,
      "perimeter_ft": 16
    },
    "4x6": {
      "label": "4' x 6'",
      "sqft": 24,
      "perimeter_ft": 20
    },
    "3x10": {
      "label": "3' x 10'",
      "sqft": 30,
      "perimeter_ft": 26
    },
    "4x8": {
      "label": "4' x 8'",
      "sqft": 32,
      "perimeter_ft": 24
    }
  },
  "kg_per_lb": 0.4536,
  "nitrile_share": 0.6,
  "nitrile_kgco2e_per_kg": 5.52,
  "nylon_kgco2e_per_kg": 6.7,
  "new_mat_kgco2e_per_kg": 6.0,
  "border_width_in": 1.5,
  "border_kg_per_sqft": 0.217,
  "border_share_of_repairs": 0.86,
  "repairs_per_mat": {
    "light": 1,
    "typical": 2,
    "heavy": 3
  },
  "overhead_kgco2e_per_mat": 0.5,
  "landfill_kgco2e_per_kg": 0.044,
  "car_kgco2e_per_km": 0.244,
  "new_mat_life_years": 5,
  "horizon_years": 20,
  "reman_life_years": 5
}