That was the front page of the Guardian website today. The expert is Dr Rajendra Pachauri, chair of the United Nations Intergovernmental Panel on Climate Change.
But it's one thing to say people should eat less meat; it's quite another to provide resources and education and support on how to do it.
Fortunately, we've got that covered.
There are tens of thousands of vegetarian recipes on the internet, including my food blog, Wednesday Food Blogging. For more inspiration, and a weekly reminder, you can sign up for Meatout Mondays weekly e-newsletter here.
So there's no reason for you not to follow the advice, is there?