Shona:
I'm sorry to get in towards the end of this, but I plead a bad week.
I'm a bit surprised that no one's mentioned it, but the word you are looking for may be futurist. I googled that and the first entry is about a World Future Society. It's got a lot of interesting stuff there. When I think of futurist, two people come immediately to mind: Bucky Fuller and Alvin Toffler.
The latter is far more readable, but Fuller is probably the more influential. He and his friend G. O. Desicdome helped shape the future of our world. One of his omre interesting concepts is an umbrellaed city (not domed and sealed, just umbrellaed) that is designed to make the most out of as little as possible. Influenced, I'm sure by Frank Wright, but an order or two of magnitude greater in the grandiosity of his plans.
I can't remember the name of the last book I read by Fuller, but it was damned near impossible for a person of normal intellect like me to get through. Marianas deep.
TEd
