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Such numbers, no source, outdated units.
It's not that simple. Pretty much all modern agricultural practices are detrimental to the environment regardless of what is being produced. The earth's topsoil is being stripped of all nutrients and the ability to retain carbon. A new approach to all elements of food production is required, regardless of if you're trying to produce meat or veg.
We're not entirely fucked, but a global, grassroots awareness of what's happening and how to change is required immediately. This won't happen by splurting out well-meaning but oversimplistic, unbalanced statements.
atk-
Although splurting out well-meaning but oversimplistic, unbalanced statements do make it easier to demonise someone else while avoiding considering their own impact.
While the article isn't entirely unbiased, it does point to some interesting and important key issues around resource demand for food production. http://www.telegraph.co.uk/food-and-drink/news/healthy-foods-that-are-ruining-the-environment/
The_Seldom_Killer
1 acre of land yields 250 lbs of beef and 53,000 lbs of spuds.