No details on the bonding agent used for binding the construction rubble. But I really wish the world comes up with alternate building materials. Currently, C

No details on the bonding agent used for binding the construction rubble. But I really wish the world comes up with alternate building materials. Currently, Cement has a large footprint. Sand used as filler, at-least in India, is in severe shortage and rivers are destroyed trying to mine it. And brick kilns consume a lot of energy.