Question

how does environmental science helped the trust decide that some dams should be removed

Answer 1

It is due to when dams are not perfectly built at it's construction sites or under the vision of engineers and this can turn into collapse of dams so the scientist sometimes give the orders to remove the dams.

Answer 2

In a need for ecological restoration and the engineering solutions to implement large-scale projects.

Many scientists believed that the dams are reducing the complete ecological benefits that can be derived from the free flowing rivers.

Also they believed that dams tend to create many environmental impact like wild life habitual destruction, changes in wildlife migration pattern, interferes the natural flow of water.