You do have a good point. Plastic wrapped cucumbers seems to be the poster child that gets rolled out because it increases the shelf life so much, I envisage us

You do have a good point. Plastic wrapped cucumbers seems to be the poster child that gets rolled out because it increases the shelf life so much, I envisage use always using at least some plastic, it's advantages aren't going to disappear. But we can do better, I've seen cucumbers with a 2nd outer plastic bag, you don't need that. All the packaging with mixed materials at the moment can't really be recycled, theres a huge amount of plastic packaged, and plastic made things, that don't need to be. Its worth pointing out that lots of people are coming at this from different angles. Some people have seen Blue Planet and don't want to pollute the ocean, some people want a sustainable solution, and some people want a low/no co2 solution. Neither of these perfectly aligns. You're looking at it from a co2/energy point of view, there are others who see plastic as unsustainable because it can't be infinitely recycled, so the glass in still better.