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Well, thats hard to say. It depends on the way of living. If the people act responsibly with the rescources and live more like the Peppers (minus the big cars and a few things), may be 500 million to 1 billion. If they live like a lot of Americans today, about 150.

You're claiming that the world would only be able to support about 150 people if those people wanted to "live like Americans"? Is that your actual belief? Just wondering, because I've never heard anything like it in my entire life.

Well, I dont know exactly, you think I guessed too high?

Did you hear about sarcasm? Of course this isn't a serious suggestion, for a whole lot of reasons I dont want to elaborate.
But fact is, that the average US citizen uses more rescources and produces more waste than other people in the world. You are not a average citizen, but also you life model cannot work for everybody else. Lets forget for a moment that most people wouldn't want to live that way.
You know, I wish you all the best for the path you have choosen. But its something I had to decide upon 40 years ago, and had to understand that its not the solution, not for me and even less for the whole society.
However, if you and your folks are happy this way - great.