Making cement adds more carbon dioxide to the environment than the entire airline industry.
Finding an alternative would make very good environmental sense. One of the suggestions is to replace cement and concrete with foamed concrete.
Foamed concrete requires less energy to produce than ordinary concrete, and has a wide array of applications.
It is also a very good material for house construction. It is true that concrete is not a good insulator and feels cold, but with this method the concrete is totally enclosed in rigid insulating foam. The foam provides the energy efficiency and the concrete provides the strength.
The concrete inside the foam also adds thermal mass to the house. In addition to efficiency, very little outdoor noise penetrates the walls.
Air infiltration into and out of a house is also a significant efficiency factor. With interlocking foam blocks or long continuous panels, there will be very little air leakage.
Also, concrete will not settle over time as traditional homes sometimes do, so these houses remain airtight.

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