nah palehorse ... that dont work ... ive done that for desserts in my game. BUT .... if u make your tundra without food or irrigation food then the AI wont go as nuts as they do for tundra and dessert.. if u set the irrigation and mining bonus to zero u cant build irrigation or mines on those squares (and it makes the map look soooooooo much better!!! without lots of clutter in crappy lands) .... but yea ... teh AI seems to recognise the habitability of an area .... so they might put a city there for resorces or even statigical value ... but the AI seems to hold off the land grabbing so much for this useless land