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Hydraulic lime plaster is similar to cement stucco, but with lime rather than portland cement. It is more flexible and more vapor permeable than cement stucco, but it takes more skill and curing time. It also requires warmer temperatures. While making portland cement requires a lot of energy and the chemical reaction releases large quantities of CO₂ into the atmosphere, Manufacturing lime takes energy, but when lime plaster carbonates (hardens) much of the CO₂ released during the manufacture is reabsorbed. (From Essential Natural Plasters, Henry & Therrien) According to Strawbale Building Details (Published by CASBA – California Strawbale Building Association)The strawbales themselves sequester 26 pounds of carbon each, preventing the formation of 95 pounds of CO₂)