Then we would also need to look at the heating costs, food quality, mobility and life expectancy. If we force everyone to go run with a bare arse in a jungle an

Then we would also need to look at the heating costs, food quality, mobility and life expectancy. If we force everyone to go run with a bare arse in a jungle and die from a snake bite at age 40 on average, we'll get the number low, but I don't think it's the future you would want. A more reasonable approach would be grouping by use case (production, shipping, construction, agriculture, commuting, etc) and addressing the highest contributors. But again, it's a billion-dollar industry vs. Average Joe with a plastic straw.