Yesterday I went to Oracle, AZ. I know, I know, now you all think I have the answers. I don't.
We toured the Biosphere 2. Rob was like a kid in a candy store! It was so interesting! In the early 90's they had a team of 8 live in the sphere for 2 years, it was completely closed off to the rest of the world. They did research on different ecosystems, grew their own food, recycled their waste for fertilizer and it worked very well! Now it's being used by U of A for water research. I feel so much smarter now, thanks, Rob!! It's pretty incredible to see in a very vivid way how utilizing natural resources wisely can sustain life...and the circle of life continues.