Tokyo's well-kept streets may not be the most obvious place to do it, but competitive litter-hunters on Wednesday sifted through the Japanese capital in their first world championship.
The Spogomi World Cup saw 21 countries battle it out to collect the most rubbish within a set time limit, scouring the streets in search of plastic, cigarette butts and other trash.
Spogomi founder Kenichi Mamitsuka started to pick up litter on his morning runs and realized that setting targets could turn it into a fun activity.