One day, reporter Ronan Kelly came across a priest with a bike walking along beside a busy road in Dublin picking up litter.
They spoke and Ronan thought little more of it until he came across a woman picking up litter on a football pitch...and then a man walking a dog picking up litter in a park...and another man with a bike picking up litter behind a supermarket.
Soon Ronan had picked up enough litter pickers to make a report.
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