From Andrew Sanderson, Spennymoor, County Durham, UK
Julian Smith describes the ecological disasters generated by digging sand for use in concrete (17 February, p 35). These are only part of the story. Manufacture of cement causes .
Published 11 April 2018
From Andrew Sanderson, Spennymoor, County Durham, UK
Julian Smith describes the ecological disasters generated by digging sand for use in concrete (17 February, p 35). These are only part of the story. Manufacture of cement causes .
Issue no. 3173 published 14 April 2018