Ecodynamics is like a game that people play with the environment. We decide how much of different kinds of resources to use, like water, land, and energy, and then we see how the environment will react. For example, if we use too much of one type of resource, like if we take too much water out of a river, then it could harm the plants and animals that use that river and make it harder for them to survive. Ecodynamics is a way of trying to understand how humans and nature go together.