The new patch 1.3.2 fixed some bugs and game balance adjusts (costs). Check the changelog.

Changelog:

• Environmental cost and building cost is the same now (destroy);
  
• Fixed bug mayor trait environmentalist;
  
• Change max water cost (200);
  
• Change min water cost (1);
  
• Change max destroy cost (200);
  
• Change min destroy cost (1);
  
• Change max agricultural ground cost (200);
  
• Change min agricultural ground cost (1);
  
• Change max erosion cost (200);
  
• Change min erosion cost (1);
  
• Change max tree cost (200);
  
• Change min tree cost (1);