Sir Paul McCartney has stepped up his efforts to persuade people to regularly cut meat from their diet by recording a song, and getting famous pals to appear in the video.

Joanna Lumley, Twiggy and actor Woody Harrelson are among the familiar faces in the video for his track Meat Free Monday which he launched online.

Sir Paul has been encouraging people to eat a flesh-free diet once a week to cut down on meat consumption in an effort to slow climate change ahead of today’s UN summit.

The rearing of livestock is a major contributor to the production of greenhouse gases

Pals, fans and the former Beatles star himself feature in the promo each holding up signs bearing the words of the song. Sharleen Spiteri, Radio 1 presenter Fearne Cotton and Sir Paul’s children Stella and Mary are also seen in the animated video which is assembled from photographs.

The rearing of livestock for consumption is a major contributor to the production of greenhouse gases which are thought to hasten climate change.