Speaking at the European Parliament, he argued the case that eating less meat would reduce global warming.
His appearance was not well received by the NFU. "Sir Paul McCartney should not be using this debate to further what are his personal, strident vegetarian beliefs," said president Peter Kendall.
Sir Paul's plea came as the English beef and lamb industry unveiled plans to reduce its environmental impact by 11% by 2020.
Food Ethics Council sets out 27 ways to slash meat & dairy (26 September 2009)
Macca doesn’t go far enough on meat and dairy, says WWF (27 June 2009)