Ecolapse

From BoardGameGeek:

In a post-apocalyptic wasteland, players take on the role of "Overseers" responsible for their faction. Magnetic hex tile holders for customisable map designs and player-chosen placements for resource tiles give a fresh dynamic to every game. Players must also battle against the Ecolapse, which flips hex tiles and renders any resources on them (Soylent or Desolene) as completely useless. As the game progresses, the usable land on the board dwindles. The savage tech tree and a unique battle system of converting enemy troops, or sacrificing your own troops, means that a calculated defeat can be more important than a victory. '-description from the designer'