PETA supporter Paul McCartney said, "After 40 years of touring as a vegetarian, I'm proud to say that when it comes to eating, there's no place like home".

To coincide with the announcement, PETA is releasing a video short hosted by McCartney.

"People ask me every day why I became a vegetarian, and I felt that in this case - unlike in my songs - images speak louder than words", he says.

In the video, McCartney shows viewers what happens on factory farms and discusses the recent UN report revealing that meat production is responsible for 18 per cent of global carbon emissions - more than all the cars, planes, trains and boats in the world combined.

The other cities on PETA's list are Los Angeles, New York, Melbourne and Mumbai.