The once-beautiful, thriving town of Greenville is now on the edge of an ecological catastrophe. The Walkers can’t allow the town to turn into a desert! They hurry to Greenville and see it covered by the pungent mist and smog. The local river is polluted by industrial waste, fish and birds vanished. Together with Walkers you will restore the land and the water, plant flowers, trees and bushes, and stock the pond with fish and crawfish!