White pebbles represent one parcel of land farmed, red pebbles represent use of chemical fertilizer, herbicide, and pesticide. White pebbles represent one parcel of land used to graze animals, red pebbles represent loss of grazing vegetation and over production of manure. White pebbles represent one day s catch from a fishing vessel, red pebbles represent population growth of less- desirable species. White pebbles represent travel by air, red pebbles represent exhaust pollution from airplanes. White pebbles represent products made from a factory, red pebbles represent pollution to air and water by that factory.
Participants draw one or more pebbles from the bag each turn.
Each community member must draw at least 1 white pebble from the bag per round to survive. It does not matter how many red pebbles are drawn. Each community member may take as many pebbles as desired from the bag. For each white pebble a participant takes, one red pebble is placed in the bag immediately. For each white pebble a participant takes, three red pebbles are placed in the bag immediately.