This sounds like a really interesting program, and is a great way to start incorporating environmental ideas into thinking about how we design our communities and spaces too.

I remember playing Sim City in a similar way, trying to replace the poluting power plants as soon as possible, building green corridors and planning for public transport. It only worked if the game was cracked to allow extra money, Minecraft (with guidance of a teacher) is a much better option as it is more open, as well as being more collaborative.