Embodied Carbon in Building Construction

Even as operational building emissions decline through renewable energy and retrofits, the carbon embedded in construction materials — cement, steel, glass, insulation — remains a massive blind spot. Manufacturing cement alone produces 8% of global CO2. As cities renovate and build to meet climate targets, they risk creating a paradox: reducing operational emissions while increasing embodied emissions from the construction boom itself.

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#00057Binding Whole-Life Carbon Limits for New Construction

Mandate maximum lifecycle carbon budgets per square meter for all new construction, declining over time. This forces architects and developers to optimize material choices from the design phase rather than treating embodied carbon as an afterthought. France's RE2020 regulation, in force since 2022, sets progressively tightening embodied carbon thresholds (−15% in 2024, −25% in 2027, −30 to −40% in 2030) that have already shifted the market toward timber, low-carbon concrete, and bio-based insulation. Denmark's BR18 set a limit of 12 kg CO2e/m2/year in 2023, tightened to 7.1 in 2025.

Switzerlandnational

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Leo Martinez

#00058Demolition Tax and Renovation-First Policy

Impose a fee on demolishing buildings below a certain age and require developers to demonstrate that renovation is not viable before granting demolition permits. The embodied carbon in an existing structure is already "spent" — demolishing it releases that carbon and requires new embodied carbon for the replacement. Basel-Stadt is implementing a version of this: a compensation fee for demolishing buildings younger than 60 years, with revenues funding a Scope 3 emissions compensation fund.

Basel-Stadt, Switzerlandcity

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Yuki Tanaka