One answer: It's About Time.
And although there is a mega-campaign going on currently, in fact the concept is much older. This is from that same campaign's page on Wikipedia:
"During World War I, the United States Food and Drug Administration urged families to observe 'Meatless Monday,' 'Wheatless Wednesday,' and other measures to help the war effort. Conserving food would support U.S. troops as well as feed starving populations in Europe where food production and distribution had been disrupted by war..."Why the history lesson? Just this: Apparently the U.S. government, as far back as World War I, recognized what a tremendous strain the meat induistry puts on natural (and national) resources. Notice the "Wheatless Wednesday" campaign? Wheat, too, is precious ("the staff of life"), and beef production uses more than its fair share.
"The campaign came back into play with the onset of World War II, calling upon women at the home front to play a role in supporting the war effort...."
So give the resources a break. If you're a meat-eater, have a vegetarian Monday. And if you're already a vegetarian, go "mooless" and avoid dairy foods for a day.
Already vegan? Good for you! Now tell a friend!
So we can all Live and Let Live.