Hi Georgina,
Quite an interested essay. I had to read it twice to really take it in, as like others a found it a little confusing at first. I liked how you include several ideas that are clearly informed by your background in biology - sometimes the behavioural sciences can forget the importance of the physical environment and miss the kinds of innovations you suggest.
I found that you're dealing with a great many topics in quite a short amount of space, and I also think I missed a couple of the references that I might have been more certain of with a background more similar to yours. I wonder if it could be worth exploring some of the ideas in more depth rather than covering so many at once? Do you have a website where you have more of your writing by any chance? The only other feedback I have is to say enclosed static communities are no simple achievement (from what I've read they are very difficult to make work) and the social science/psychology of such a community might be quite an interesting topic to try to explore in detail.
All in all a great read I enjoyed it very much, and I hope you write more on these topics!