[Daisywh]

Ever since energy conservation and environmental protection became a focus, supermarkets have started charging for plastic bags. But I think relying on this kind of approach to reduce usage does not really solve the root problem. Instead of using penalties, we should be thinking of practical and eco friendly alternatives that make people genuinely want to change their habits.

[CalRobert]

Penalties are a key part of the picture though. They help cover the otherwise unpriced negative externalities.