I'm working on a version of Champs Les Sims, everything's well and fine.
Except distant terrain.
Trees are cardboards. Or more likely, the alpha is not working. The trees are visible and the alpha is green ...
I've noticed it's the same in the real Champs Les Sims.
As my settings are on high, it doesn't seems like that's the problem.
Was it always like that in France ? Is there something I can do ? Suggestions ?

Yeah, I get this too. Really annoying and I know for a fact it hasn't always been like this.

There's likely been a change in the shader that the map used to use, so now it no longer renders the alpha transparency properly

I would fix it, but I don't go to Champs les Sims enough to put it at the top of my list. It would likely entail cloning the object in TSRW and changing the shaders/shader settings used, and then changing the new object into a default replacement.

Cool, then I'll do it for you.