Meat Free Monday is a campaign to convince people who eat meat to skip eating it one day of the week to help reduce their carbon footprint. As any self-respecting Beatles fan knows (or Simpsons fan for that matter), Paul McCartney is a guy who skips eating meat seven days of the week. He once wrote a song titled “Meat Free Monday” to encourage people to take that pledge, and now it’s resurfaced with a new video. The campaign released a new lyric video for the track featuring photos sent in by fans who took the pledge. It was posted this week as global leaders flock to the UN headquarters in New York for the first major discussion on climate change since the 2009 UN Climate Change Conference in Copenhagen. Watch it below.