Sir Paul McCartney is ramping up his campaign to urge fans to give up eating meat on Mondays to save the environment.

The former Beatles star and well-known vegetarian has teamed up with U.K. Energy and Climate advisor Greg Barker to front the Meat Free Monday campaign, which aims to "catalyze transformative change and bring awareness to the global footprint that meat production has on the environment".

In a new video posted on Thursday (18Sep14), McCartney tells fans around the world, "Hi there, Paul speaking. Listen, I need your help. All I want you to do is just log in on pledge.meatfreemondays.com and pledge your support to the idea of Meat Free Mondays.

"That's all you need to do, I need your help. Please do it. We'll send all these pledges to the politicians and then they'll do something about it."

Meat production is responsible for at least 14.5 per cent of global greenhouse gas emissions. The issue will be discussed at the Climate Summit in New York City on 23 September (14), marking the first time members of the United Nations will discuss the topic since 2009.