There is nothing surprising or new about it. This is also exactly what we concluded in a course on environmental sustainability in business school. Again, not all vegetarian dishes are environmentally sustainable. We need to remove many of our favorite vegetarian dishes too to save the planet. Besides, carbon, the problem is water. A plate of beef takes as much as a 5000 liters of water to make. Imagine large countries like India and China going completely meat-eaterian.