Are you morally obliged to pick up litter in your neighborhood? - Big Think
Litter Pickup: DIY Volunteering — Pease Park Conservancy
8,000+ Picking Up Litter Stock Photos, Pictures & Royalty-Free Images - iStock | Family picking up litter, Picking up litter on beach, Children picking up litter
Pick up one piece of litter everyday (or more if you can!) - EasyEcoTips
From Trash to Change: How Picking up Litter Can Spark Global Action