> at least where I live, I've seen a big push for the reduction of of single use plastics, both through legislation, savvy consumers and responsible supermarkets

Have we? Or have we just seen campaigns and legislation against plastic straws and supermarket bags, which amounts to mere virtue signalling and greenwashing by corporations and governments?

We need to do much better than ban plastic straws and advertise how we've saved the world. Properly pricing in externalities onto the price of single use plastics would probably go a long way to motivate the market to give a shit.