Backyard chicken production is an integral part among rural families in the tropics like the Philippines. However, it has been declining as it continues to suffer low productivity with its small-scale operations. Among its production inputs, feeds remain to be the top cost driver, as well as the top contributor to greenhouse gas (GHG) emissions that result in global warming potential (GWP). In a prior experiment, 50% inclusion of Azolla Pinna was recommended in feed ration due to its favourable and comparable growth performance of Dominant DZ backyard chickens. Hence, this study further evaluated the inclusion in terms of environmental performance. The 50% inclusion resulted in reductions of CO2 by 35%, N2O by 22.32%, and CH4 by 4.74%. The gross effect of this reduction of conventional feeds is a climate change mitigation equivalent 28.47% of GWP kg CO2 -eq./1,000 birds. The potential impacts indicate that Azolla Pinnata can be a cost-effective and sustainable feedstuff in backyard chicken rearing system especially that it requires simple propagation method. The environmental impacts and savings can encourage more livelihood activities in rural.