It takes 14 times as much biologically productive land to produce 1 ton, or 907 kilograms, of beef as it takes to produce 1 ton of grain. It takes 1.9 times as much biologically productive land to produce 1 ton of pork than it takes to produce 1 ton of grain.
Furthermore, global livestock is responsible for 9% of all anthropogenic carbon emissions, according to the Food and Agriculture Organization of the UN. To put it bluntly, reducing meat consumption is a great way to reduce our Ecological Footprint.