Shalmanese
I'm not picking on you. I like to summerize the whole thread too sometimes. But here's my thoughts on your thoughts.
Predicting the rate populations increase is difficult. In the early 50's People from the USA averaged more than 3 kids per household. Couples also tended to get married earlier. At that time most studies predicted that it would always be that way.
I think it's safe to say that the capability to adjust to changes in demographics/population will simply be a slow evolution (that's good, right?) during our lifetime.
Enhancements in the internet that are still to come will allow humans to be less dependant on each other, and encourage people to spread out to the less populated areas. For example, many won't have to commute to work anymore. But kids will still need to be close enough to each other to gain from social interaction. ie, go to school.
As 3rd world countries become Westernized (that is good, isn't it?) there are some who say that they will tend to have only the children that they can support thru college or equivilent and that underpopulation might be a problem, a least in a political sense. (Some governments need chaos to survive).
Food production like energy production will match the market. I think it always has. Those who can pay for food have it and those who can produce the food will sell it to them. Prices don't vary any more for food than the price changes in SDRam or oil.
Polution prevention is simply a cost. Damage to the environment in 3rd world countries is a political (potentially controllable by government) problem not an overpopulation problem, per se.
So why is everyone "hung up" on meat and bad mouthing McDonalds? McDonalds will sell you just what you want and need, just like Microsoft

Remember this thread originally was about Texas. It's a fact that a good chunk of Texas is only suitable for raising cattle. BTW these cattle do not require many suppliments or cattle feed. Later (90 days before processing) you CAN fatten them in a feed lot IF the price of grain is low AND you desire/require certain characteristics (tender steaks) or grades of beef. If you think beef is "bad" that's your business. For people in those rural areas of Texas, that's THEIR business.