A new world of sustainable building practices is bearing down upon us, with embodied carbon considerations pushing to the fore. Air/water tightness and insulating factors are so last century. Vancouver will begin asking for environmental product declarations on new builds this summer, with limits on the allowed embodied carbon coming within two years. Here to explain it all is Caroline Butchart, a building engineer with a PhD in structural glass, who is the program manager for the Carbon Leadership Forum, a non-profit group assisting the B.C. construction industry to meet sustainable building goals.