6K Man
Bureaucrat
Ice river can get a watermill, but that's all. Tundra with fresh water can get a farm and with a river can get a watermill. Forested tundra can get a lumbermill or a forest preseve. You can't actively do something to improve these tiles. They are there to make city placement a bit more tactical. Not every spot is very useful.
Windmills and Mines can be built on Ice/Tundra/Desert Hills.
Tundra next to water also allows Cottages. I have also noticed that you can't Farm Tundra that's away from water but adjacent to a Farm, regardless of whether you have Civil Service.
The trick with Tundra is to not chop forested Tundra flatland that has no access to fresh water. If you have unforested flatland Tundra, just hope a forest grows on it.
