Just one more storey? The embodied greenhouse gas impacts of adding height, slab thickness, building code and design tranches is a paper written by Avery Hoffer of the Department of Civil and Mineral Engineering, University of Toronto, which contradicts just about everything I have written about building height. Hoffer, seen presenting his work last year, concludes: “Don’t fear height, fear bad design.” …Hoffer says on his concluding slide, “historical skepticism of tall buildings does not hold up when evaluated through the lens of embodied GHG emissions.” I wrote in my recent book, “When you look at the world through the lens of upfront carbon, everything changes.” Same lens, opposite conclusion! Hoffer references my two favourite studies: Francesco Pomponi’s “Decoupling density from tallness in analyzing the life cycle greenhouse gas emissions of cities”, which found that high-density low-rise buildings have half the life-cycle greenhouse gas emissions of high-density high-rise buildings.