Which of the following games in the Anno series introduced the "Eco Balance" gameplay mechanic?
Explanation
In Anno 2070, players had to maintain an ecological balance between three resources - energy, food, and water - to keep their population happy and their economy thriving. The Eco Balance system introduced a new layer of strategy where players had to manage their production and consumption rates carefully. If one resource became depleted or polluted too much, it would negatively impact the others, leading to social unrest and economic collapse.