Reducing the toxicity and amount of emission pollutants coming from brick kilns is also an expected benefit to implementing energy efficient technology. 2.1: Boat-to-rotary kiln upgrade. Roughly estimated GHG emission reductions: 0.03 MtCO2eq/year for 8 rotary kiln replacing same amount of boat kilns. Each rotary efficient kiln is estimated at USD 200,000 cost.