I remember reading somewhere that over 80% of the grains grown in the U.S is for animal consumption, not human. Those animals are then slaughtered for human consumption. I don't know how true that number is, but even if it is half that, it is still highly inefficient and wasteful. That article also calculated the amount of resources (water especially) to produce one pound of meat vs a pound of fruits/vegetables.

None of this is rocket science, it is fairly straightforward to understand. Reducing meat consumption makes sense economically, ethically, environmentally etc. But, people like their hamburgers and their sea food and their KFC...