A second example of the possible widespread and ramifying ecological consequences of atmospheric pollution is provided by acid rain.
Construction of large dams and barrage to control water flow and to give a head of water creates large reservoir from which further evaporation can take place.
The seepage of water is responsible for upward movement of ground water.
The human impact on vegetation is greater than on any of the other components of the environment.
The nature of whole landscape has been transformed by human-induced vegetation.