Externalities of Festivals - Is there a case for a new tent tax?

Campaigners are calling for a £25 “tent tax” for summer festivals as thousands of festival-goers continue to leave behind their Uber-cheap supermarket tents (and whatever detritus lies inside them) for others to clean up afterwards.

The average tent is mostly made of plastic - the equivalent of 8,750 straws or 250 pint cups.

How strong are the economic arguments for such a charge? Can you think of some unintended consequences from a tent tax? Are there better options for nudging people to change their default behaviours?

Design is also key - i.e. encouraging innovation to create new materials, designing for longevity, new systems for reuse and rental services, attempts to change social norms - all can play a part.