Please add obvious sources of pollution to this image. Replace the building in the foreground with a wastewater treatment plant that is discharging into the river via a point-source pipe. Add a factory to the side of the river with one chimney, and a discharge pipe entering the river. Add some cows to the field next to the river that can access the river bank to drink, causing erosion. Add a tractor to the fields on the right which is spraying pesticides on the crops.