Question 1:  I read an entry by KhaineGB posted above (Tuesday) about turning occlusion off if objects are disappearing.  I went to do so, but found occlusion greyed out and non-responsive.  Do I need to change something else to make that possible?  Thanks.
Question 2: Do the new DF maps have all the same biomes (forest, snow, burnt, desert, wasteland, radiated) or have a couple been eliminated with A20?  I've explored about a quarter of the map looking for the burnt biome and coal to make gunpowder, but so far have seen a lot of forest, and little snow and desert.  Just wanted to check to make sure I wasn't looking for something that was gone.  If biome changes, where are the minerals now?  Thanks.