Plastic straws or plastic soda / water bottles. We all see them everywhere. I would have no problem doing away with plastic bottles. Think Cocoa Cola, Pepsi or the milk companies would get on-board?
No major corporation would get on board if it means raising prices.
Worked for the automakers. Why not model it after the automotive industry regulations? Make a goal to reach xxx by 20xx or get fined. It allows the manufacturers to develop their own strategies to comply and remain competitive.