To my mind, this is a no brainer - tax takeaways that can't be bothered to use bad materials that harm the environment. Takeaway boxes that are not environmentally friendly should be heavily taxed. These are a major source of litter and such a tax would make suppliers switch to better materials that are better for everyone. In the end few will pay as they will just use better materials. Switching is easy and they just need a nudge.
I also get annoyed with supermarkets: these days all packaging should be environmentally friendly. The big supermarkets should be blazing the trail and telling their suppliers. Waitrose is bad, with lots of their packaging unclear about whether or not it can be recycled. I find this totally not excusable in this day and age. They should lead the way.
See http://www.bbc.co.uk/news/business-42033760 .