Just pick up a few pieces of litter when you’re out and about or go on a dedicated litter picking walk! You’ll soon collect 20. Try not to use a new plastic bag for your litter and dispose of items in the recycling, if possible, to maximise your impact.
Litter can be hazardous for wildlife, as well as being unsightly for us. Disposing of litter correctly not only means it is no longer a danger to wildlife but, if it can be recycled too, it saves another item going to landfill.