Tents being left at festivals is a huge waste of resources and  an environmental problem. There is a misconception that charities can use the tents but may are damaged and end up in landfill, we need to educate festival goers as to why this is not acceptable and make it much harder for festivals to condone this happening. A very simple solution would be to take a healthy tent bond on entry, eg £100, this could be returned upon sight of the tent at the end and if not collected it can be donated to environmental charities, This should simply be a term of the licence, as Leeds seems to be worst it should lead the way.