This article from One Green Planet visually summarizes the impact of meat on land, grain, poverty, water, endangered species, fossil fuels, pollution, and climate change. A must-see!!
Similarly, this video from Eat For Planet uses the same tools in an animated way to illustrate the water footprint of ice-cream, milk, and beef. For example, it takes 2000 gallons of water to produce 1 gallon of milk.