Wood, one of the world’s oldest building materials, could make a comeback in the next decade if mass timber can overcome a range of challenges as the green transition gains momentum in Canada’s construction industry. …Lighter than concrete or steel but strong enough for use in load-bearing beams and columns, mass timber has environmental and construction virtues that could dramatically change the building landscape, green construction advocates say. …An industrial roadmap from the Transition Accelerator, an Ottawa-based think tank, argues that using mass timber in place of conventional construction materials could cut “embodied carbon” – the emissions produced during manufacturing – by 40%. …How sustainable is mass timber? It depends on several factors, including the source of wood, how it was harvested and the ongoing health of the forest. …Nevertheless, mass timber proponents believe there is a clear economic development angle for the sector in this country.