New construction produces as much as 10 to 15 per cent of Toronto’s total emissions, reflecting concerns from experts about the environmental cost of demolishing old buildings
A proposal to tear down the 25-storey former headquarters of The Toronto Star to build two even larger towers has put the spotlight on climate concepts known as embodied carbon and more sustainable “circular” construction ideas.
“It takes a lot of emissions to create concrete, to create steel. Those are emitted during the production phase. … It’s really important to prolong the life of materials we’ve created, as we’ve already invested the carbon into those and anything we can do to maximize those materials is a great carbon decision,” said Ryan Zizzo, an engineer and CEO of Mantle Developments, who has consulted with the city on incorporating the concept of embodied carbon into its green development standards he said.
The height of the new buildings also ties into the carbon discussion, according to Kelly Alvarez Doran an adjunct professor of architecture at the University of Toronto and CEO of Half Climate Design. “Tearing down a 50-year old 25-storey building only to build 100 storeys is basically building 75 storeys at the embodied carbon of 125,” said Mr. Alvarez Doran
The Listing Noastack Building Carbon Cent Toronto Density Buildings Construction Emissions Adrian Smith University Of Toronto Toronto Star
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