Replying to my own comment. Initially, I was thinking that the mention of CO2 was related to carbonation in the drink. It's now clear to me that it was referenc

Replying to my own comment. Initially, I was thinking that the mention of CO2 was related to carbonation in the drink. It's now clear to me that it was reference to CO2 emissions of transporting goods that would be significantly heavier. It seems to me that if CO2 emissions for distributing heavier, reusable glass containers is a significant problem for our society, I can't imagine what we'll do with all the other (unrelated) things we have (and do) that have much bigger problems with emissions.