Meat-Free Monday is an idea coined by the McCartney family (Stella and Paul), they released a cook book about 'going' meat-free and enjoy a meat-free lifestyle. They talk about the ramifications of eating meat, the waste, the effect on the environment, and it has extensive back up research. Whilst going completely meat-free is their goal, and how they live their lives, they understand not everyone feels the same, so they advocate at least meat-free Monday when you can try, at least, to give up meat for one day of the week.
Jamie Oliver practises this, as well as a host of other celebrities and chefs who have made this dietary choice.
I personally eat meat as often as I like, and vegetarian foods as I like, but do I follow Meat-Free Monday? Unfortunately no, but I am giving it a go for this next month, to see how I feel, and hey, saving the animals, our crops, and largely, the world, is surely a better way to live.