Plastic coffee cup waste is being cut by a simple change

A simple change in the way hot drinks are priced at one university has made a big difference to the number of cups that are thrown away, and it's not costing customers anything extra.

A smartphone film by Dougal Shaw, external for BBC World Hacks. Like, Share, Engage.

Check out easy ways to reduce your plastic footprint on the BBC's Plastics Watch site.