Supply chains are not 100% transparent. We know how bad one unit of "cigarette" is for our health, but we don't know how bad one unit of xxx is for the environ

Supply chains are not 100% transparent. We know how bad one unit of "cigarette" is for our health, but we don't know how bad one unit of xxx is for the environment. An apple can have a co2 footprint of multiple tons of co2 or zero tons of co2. We can't know for sure.