Livestock a major threat to environment

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This group:
Livestock a major threat to environment

Came up with this report:

Livestock’s long shadow


An NY Times editorial:

Meat and the Planet

From the editorial:

But what is even more striking, and alarming, is that livestock are responsible for about 18 percent of the global warming effect, more than transportation’s contribution. The culprits are methane — the natural result of bovine digestion — and the nitrogen emitted by manure. Deforestation of grazing land adds to the effect.

So going back to the horse and buggy would be worse than driving automobiles I guess. How come the folks decrying the use of fossil fuel don't seem to mention this very often regarding livestock? At least that's my perception.