Canada is a nation of builders—but buildings are our third biggest source of greenhouse gases and release some 90 million tonnes of C02 annually.On Part 1 of a special two-part series of Disruptors, an RBC Podcast, focused on greening Canada’s built sector, host John Stackhouse chats with three experts committed to decarbonizing our buildings. Together, they explore the question, “how can retrofitting old buildings help get us to Net Zero?” We hear from Kent Peterson, owner at engineering services firm P2S and Chair of the ASHRAE Task Force for Building Decarbonization . We then chat with Jody Becker, the Chief Strategy Officer, Executive VP, Infrastructure Services & Technology at construction services firm Ellis Don, and finally Jamie Gray-Donald, the SVP of Sustainability & Environmental, Health & Safety at QuadReal Property Group.       It turns out our existing buildings present the biggest opportunity to transition the building sector for a more sustainable, Net Zero future. Stay tuned for part two, where we explore new technologies, techniques, designs and innovative materials for a more sustainable future. Links:To read RBC Climate Action Institute’s latest report, “High Rise, Low Carbon: Canada’s $40 billion Net Zero Building Challenge”, click here.To sign up for “Climate Signals”, a new weekly newsletter from the RBC Climate Action Institute on the world’s path to Net Zero, click here to subscribe. To learn more about P2S Inc., check out their website here. For information on ASHRAE, visit their website here. To learn more about Ellis Don, visit their website. To learn more about QuadReal Property Group, visit their corporate website.