I am looking for a set of rules, (if possible a full game), that allow players to take an active part in changing the world, and its the world itself that's their greatest enemy. It could be a sci-fi game about colonizing an alien world, a near-future game dealing with climate change, or fantasy game about fighting an ice age. The specifics don't matter as long as it deals with the topic of terraforming, environment modification or changing the climate. Ideally, it would be possible to plug this system into any other RPG which would deal with actual adventures.
I would expect this system to provide consistent rules for the following:
- Climate in a region and how it affects living conditions, food production, etc., and how that connects to PCs' resource management.
- Means and effects of changing that climate, both immediately (do a quest to find a McGuffin) and via a long-term project (hire people to construct a dam). Therefore, it would also need some rules for managing man-power and other resources.
- How changing the climate in one region affects other regions.
While all of this can be hand-waived by the GM, I would prefer to have a rule system that can guide my actions and allow players to make predictions about the consequences of their actions.