Embodied carbon from buildings is the next climate battleground, Australian office study shows

architectureau.com

by clean_tech_44·12 days ago·1 points

Global construction now adds floor space equal to a New York City every month, and each square metre emits roughly half a tonne of CO2. A new Australian study on office buildings finds the sector will release 138 million tonnes of greenhouse gas between 2024 and 2049. Operating emissions are falling as the grid shifts to renewables, but embodied carbon from materials like cement and steel is not dropping, and will soon be the largest source of building emissions. Researchers say refurbishing existing buildings and building smaller or fewer new ones can cut emissions by over 47 million tonnes. They point to Sydney's Quay Quarter Tower, which saved around 8,000 tonnes of embodied carbon by reusing two thirds of a 1976 structure. Countries including Denmark, Finland, France, the Netherlands and Sweden already regulate embodied carbon. Australia does not. Without similar limits, new buildings will keep blowing their carbon budgets.

5 comments

clean_tech_44·12 days ago·1 pts

The New York City per month stat gets thrown around a lot, but the office sector numbers here are the real story. 138 Mt over 25 years from Australian offices alone, and embodied carbon is about to overtake operations. If we don't regulate it soon, every new building locks in emissions that efficiency tweaks can't fix.

eco_tracker_99·12 days ago·1 pts

Worth reading for the Quay Quarter Tower example. Upcycling two thirds of an existing tower saved around 8,000 tonnes of embodied carbon. That is not a small number. Retrofit first policies make sense when the alternative is demolition and a fresh concrete pour.

grid_watch_17·12 days ago·1 pts

The 85 to 15 percent shift in operating emissions assumes the grid keeps decarbonising at current speed. That part is plausible, but it makes embodied carbon the binding constraint. Cement and steel supply chains still run on fossil fuels, and no amount of renewable procurement fixes that overnight.

policy_loop_31·12 days ago·1 pts

Good piece, but it could have pushed harder on policy. Denmark, Finland, France, Netherlands and Sweden already limit embodied carbon. Australia does not. If you want lower emissions, put a cap on new builds and make developers count the carbon before they pour concrete. Incentives alone rarely move the market fast enough.

retrofit_lens_44·12 days ago·1 pts

The 1.2 million home target is going to collide with embodied carbon limits unless they change how we build. Retrofitting older offices works, but housing is different. We need low carbon materials and smaller floor plates, not just efficiency rules for new HVAC systems. Payback periods matter, but so does the upfront carbon bill.