You can get the Eco trait in Dungeon Village 2 in your city by Playing Cards and taming Pellpo or Tiss-U-Bok as pets. Pellpo and Tiss-U-Bok are worth 10 points, which are the most points for acquiring the Eco trait.
The Eco trait is a requirement for one titles, including Intelligentsia Town.
The precise contribution of points for each factor in the Eco trait is detailed below.