Search Joel Salatin for more info. He has a number of sustainable local systems for chickens, pigs etc.
The only way to sustain this level of meat consumption is by utilizing the current industrial practices.
I just thought it was interesting that possibly chickens could be run on more marginal land as cattle are now.
This might become more attractive if fertilizer prices keep going up.
Search Joel Salatin for more info. He has a number of sustainable local systems for chickens, pigs etc.