The LibDems are going to save the planet by charging 5p each for plastic bags from supermarkets and large shops. It is not the worst idea that anyone has come up with, 81% reduction in NI, 75% in Wales, but it only scratches the surface.
What about all the plastic packaging used on fresh food: four fruits on a polystyrene tray and wrapped in a plastic film, that sort of thing? More plastic bags are used to wrap loose fruit and veg. Ready meals come in layers of plastic and cardboard. Dry goods live in oversized cartons to make it look as though we are getting more for our money. Have a good look around the next time you go shopping: it's plastic, plastic everywhere............ and despite the best efforts to get us to recyle, a lot of it goes to landfill or gets dumped at the side of the road.
However, the best way to tackle the problem would be at source not the end of the line. My belief that that will not be done is a basic economic one. Plastics are a valuable by-product of the petrochemical industry; without them the world would be awash in cheap, low grade and very dirty fuel. There is a lot of money to be made producing plastics and 5p per bag will change nothing in the long run.