constants = ({
co2: "CO₂",
co2_protein: "kg CO₂ per 100g of protein",
co2_kcal: "kg CO₂ per 1000 kcal",
co2_kg: "kg CO₂ per kg",
land: "Land usage",
land_protein: "Land use per 100g of protein",
land_kcal: "Land use per 1000 kcal",
land_kg: "Land use per kg",
eutrophication: "Eutrophication",
eutrophication_protein: "Eutrophication per 100g of protein",
eutrophication_kcal: "Eutrophication per 1000 kcal",
eutrophication_kg: "Eutrophication per kg"
})