A recent study on the environmental impact of automatic fire sprinklers is documented in a two part series. The present paper examines the relationship of automatic fire sprinkler technology to environmental sustainability. Large-scale fire tests were conducted using identically constructed and furnished living rooms. In one test, fire extinguishment was achieved solely by fire service intervention, and in the other, a single residential automatic fire sprinkler was used to control the fire until final extinguishment was achieved by the fire service. Comparisons of the total greenhouse gas production, quantity of water required to extinguish the fire, quality of water runoff, potential impact of wastewater runoff on groundwater and surface water, and mass of materials requiring disposal between the two tests were made. The results show that in addition to providing life safety and limiting property damage, the use of automatic fire sprinklers is a key factor in achieving sustainability.