Glass has externalities as well. If all transportation weight is significantly higher that is going to have a large impact on global warming until we switch to clean transportation which to be frank is a long ways off if we are being honest.
Meat, plastics, metals, gas, everything that generates greenhouse gases in significant amounts has to become costlier so people consume it less.
It's been proven time after time that we won't reduce emissions by appealing to the social conscience of people and corporations, but everybody obeys economic measures.
