Is there a definition what biome selection does actually with your resources? (alpine = + 10% wood, nubia= -5%wood+5%stone, or the like) If that was the case, I could select (in SP a biome that suit my civ best or olne that poses most constrianed environment. That could be quite interesting!  

A balanced version could be made.

Oh, I was not aware - if you have a standard map and change the biome - do you get actually different resources?  I had assumed that the amount of resources is given by the abstract map and the biome is more eye candy (to be a bit provocative). Thought this is why the abstraction mod does not need to use any biome, or does it?   Sorry for such noob questions!

pretty much

Unfortunately it can sometimes be down, which will give that error. But at least at the moment I'm writing this it's working.

Each biome have different resource availability/scarceness. It definitively have an impact on game-play. It also has an impact of civilizations balance.

Sounds good, but the differnt biomes do not have ANY impact on gameplay. As far as I have seen, biomes , while visually attractive, do not impair or prefer a capability. You can build a farm in snow as well as in a desert as well aws in a swampy area; there is always a type of trees growing, elephants survive even in the arctic - all well justified in the interest of balanced gameplay. Just the biome itself does not seem to  contribute at all. A "4-seasons biome" would impact strategy only if you could not grow a farm in a desert or in snow (you would probably have to revert to animal breeding instead), or your elphants or camels have alimited lifetime in the cold, or the like. So if you would change from one biome to another you'd need to consider this effect.