Environmental manipulation can be described as the interventions of human beings in the environment in a way such that the consequences are unpredictable. The way nature response to the activity of human beings can be in any manner. It can accept it or cannot accept it. The activities such as manipulation of genes in crops(genetic engineering) can be profitable but on the other hand the invasion of human beings into forest can cause drought as well.This is because of the unbalanced ecology.
So, the consequences of environmental manipulation is unexpected.