What do Paul McCartney, the Baltimore Unified School District, and the city of San Francisco all have in common? They have all stopped eating meat on Mondays. In efforts to curb climate change, cities around the world are promoting citizens to eat less meat, since livestock is a large source of greenhouse emissions. From meatless Monday school lunches in Baltimore to "Veg Days" in San Francisco and Ghent, Belgium, cities across the world are experimenting with the cause. Paul McCartney even wrote a song about it!
