Carbon negative cement?

The Achillies heel of concrete as green building material is that the cement manufacturing process produces enourmous amounts of CO2, about 5% of global emissions annually.

The Guardian reports on a promising breakthrough: a magnesium slicate based cement that absorbs cement over its lifetime, therefore making it carbon negative which has obvious and significant environmental implications. It looks promising, although a lot of work will have to go into certifying it a a structurally adequate material.

Something worth following, though.