Allows Farms to be built on Tundra terrain. After Civil Engineering is unlocked Farms can be built on Tundra Hills. In Snow, Tundra, Snow Hills, and Tundra Hills all Mines, Lumber Mills, Pastures and Quarries provide +2 Production, Farms, Camps and Plantations provide +2 Food, and strategic resource accumulation rate is +100%. Reduces the purchase cost of tiles in these terrain types by 50%.