How a Maryland landscaper turned street litter into a message of love / How population density and location shape litter levels facing UK communities / From cat litter to incontinence pads: UK shoppers on how 'porch pirates' got caught out / Meet the man who busks from inside a litter bin / 'Litter picking is my way of earning benefits' / Fundraiser for girl's dream of 'litter-free world' / Amsterdam takes extra measures against litter in crowded areas / How San Francisco's "trash detectives" catch litter bugs / Scottish Parliament in litter warning to media after 'rubbish dumped'