McCartney invited his daughters Stella and Mary, as well as Hollywood friends Emma Stone and Woody Harrelson to join him in the 5-minute documentary, One Day A Week, about the impact of animal agriculture on the environment.
"I'm amazed at the things we humans have been able to create, like the skyscrappers in New York, and paddy fields cultivated the same way for hundreds of years," he says in the film, which he narrates over gorgeous footage of planet earth and its inhabitants, leading, one anticipates, to his main point.
"But with this success comes responsiblity to preserve the delicate balance to which we owe our existance."
One Day A Week is an extension of the Meat Free Monday campaign McCartney began back in 2009.
“There’s a simple but significant way to help protect the planet and all its inhabitants,” he says. “And it starts with just one day a week. One day without eating animal products can have a huge impact in helping maintain that delicate balance that sustains us all.”
Arguing that livestock production is the number one cause of releasing greenhouse gases into the atmosphere, McCartney and cohorts contend that it takes unsustainable levels of precious resources including land, fresh water and energy to continue the practice.
Funded by Bloomberg Philanthropiesand produced in collaboration with Hope Production, the production company of French film director Yann Arthus-Bertrand, One Day A Week suggests that eating vegan one day a week would contribute greatly to global climate safety.
McCartney, who has been a vegan since a 1975 fishing trip turned him off eating meat and fish, has been a constant advocate of his lifestyle, appearing in numerous PETA campaigns throughout the years, narrating animal rights videos and supporting U.S. Humane Society and World Society for the Protection of Animals Campaigns.
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