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One Australian researcher has proposed that, if the traditional calcium carbonate-based Portland cement used in the construction industry were changed to a cement based on magnesium carbonate, almost every construction in a city-from bridges to factories to apartment blocks-could soak up carbon dioxide. Emissions would also be drastically reduced at the production stage. Whereas a ton of CO2 gases escapes into the atmosphere for every ton of Portland cement produced, with the magnesium-based eco-cement, emissions are almost halved. In addition, different types of refuse, such as plastics, rubbers, and agricultural waste, can be used as a bulking material in the mixing of this cement, thus contributing to the easing of another environmental problem-that of waste disposal. The main difficulty with eco-cement is that the building industry is very conservative, but as the need to solve the problem of CO2 emissions becomes increasingly urgent, eco-cement may still have its day.