{
    "transportation": {
        "car": {
            "co2_per_km": 0.17,
            "source": "https://ourworldindata.org/travel-carbon-footprint"
        },
        "bus": {
            "co2_per_km": 0.10,
            "source": "https://ourworldindata.org/travel-carbon-footprint"
        },
        "train": {
            "co2_per_km": 0.035,
            "source": "https://ourworldindata.org/travel-carbon-footprint"
        },
        "motorbike": {
            "co2_per_km": 0.113,
            "source": "https://calculator.carbonfootprint.com/calculator.aspx?tab=6"
        },
        "bicycle": {
            "co2_per_km": 0,
            "source": "https://ourworldindata.org/travel-carbon-footprint"
        }
    },
    "energy": {
        "ac_usage_per_m2_per_hour_kwh": 0.15,
        "co2_per_kwh": {
            "value": 0.5,
            "note": "Varies by region. Example average for US/EU.",
            "source": "https://www.eea.europa.eu/en/topics/in-depth/climate-change-mitigation/greenhouse-gas-emission-intensity-of-electricity-generation"
        }
    },
    "food": {
        "meat": {
            "beef": {
                "co2_per_kg": 36,
                "source": "https://ourworldindata.org/carbon-footprint-food-methane"
            },
            "pork": {
                "co2_per_kg": 12,
                "source": "https://ourworldindata.org/carbon-footprint-food-methane"
            },
            "chicken": {
                "co2_per_kg": 9.9,
                "source": "https://en.wikipedia.org/wiki/Individual_action_on_climate_change"
            }
        },
        "fish": {
            "salmon": {
                "co2_per_kg": 13.6,
                "source": "https://www.bbc.com/future/article/20200211-why-salmon-has-a-bigger-carbon-footprint-than-chicken"
            },
            "sardine": {
                "co2_per_kg": 2,
                "source": "https://www.bbc.com/future/article/20200211-why-salmon-has-a-bigger-carbon-footprint-than-chicken"
            }
        },
        "vegetables": {
            "lettuce": {
                "co2_per_kg": 3,
                "source": "https://ourworldindata.org/carbon-footprint-food-methane"
            },
            "tomato": {
                "co2_per_kg": 2,
                "source": "https://ourworldindata.org/carbon-footprint-food-methane"
            }
        },
        "legumes": {
            "peas": {
                "co2_per_kg": 0.98,
                "source": "https://en.wikipedia.org/wiki/Individual_action_on_climate_change"
            },
            "tofu": {
                "co2_per_kg": 3.2,
                "source": "https://en.wikipedia.org/wiki/Individual_action_on_climate_change"
            }
        }
    }
}