07/17/2009 05:12 am ET | Updated May 25, 2011

Paul McCartney And Yoko Ono Push 'Meat-Free Mondays' (SLIDESHOW)

AFP: Beatles legend and famous vegetarian Paul McCartney was joined by John Lennon's widow Yoko Ono Monday to launch an appeal for "meat-free Mondays."

McCartney said going vegetarian, even for just one day a week, was good for the environment because of research suggesting it cuts greenhouse gas emissions from the world's livestock population.

Some of the folks who came out to support Meat-Free Mondays:

McCartney and Yoko push 'meat-free Mondays'