The carbon dioxide of cement used in concrete must be captured!

It's a real problem to decarbonize cement.  But as the Economist reports, English firms tackling the making of cement, have found using recycled cement from a demolished cement structure is suitable for resurrecting a new building.  That is, taking the cement powder from a torn-down cement structure makes its replacement!  Comments the editors, "the green benefits of a circular economy." (April 29 issue, p. 66).