Comment by thmsths

That's an interesting tidbit. Every time there is a suggestion we switch to reusable glass bottles instead of plastic, someone raises the issue of the extra weight of the bottle which will lead to greater carbon emissions during transport.

But if, as you say the largest emission comes from manufacturing the plastic bottle, not the transport of the bottle AND the content; then it seems possible to lower the carbon footprint by switching to glass (on top of the other advantages like reducing landfill use/litterring/environmental pollution).