【WEF】2023循环建筑白皮书：最大化减少碳排放创造商业机遇_29页_5mb

报告摘要

Summary of "Circularity in the Built Environment: Maximizing CO₂ Abatement and Business Opportunities"

Core Content

This white paper explores the potential of circularity in the built environment to reduce carbon emissions and unlock economic value. It highlights the urgent need for transitioning from linear to circular systems in construction and outlines strategies for six key building materials: cement and concrete, steel, aluminium, plastics, glass and gypsum.

Main Viewpoints

Circularity offers significant opportunities for CO₂ abatement and economic value creation.
The built environment is responsible for 26% of global greenhouse gas emissions, with embodied emissions playing a major role.
The paper identifies nine circularity loops and assesses their potential across three dimensions: resource recirculation, resource efficiency, and resource utilization.
Lighthouses—industry leaders that implement circularity solutions—play a critical role in driving the transition and setting examples for others.
The transition to circularity is not only environmentally necessary but also economically viable, with substantial net value gains and CO₂ emission reductions projected for 2030 and 2050.

Key Information

CO₂ Abatement Potential

By 2030, circularity could abate 0.5–0.8 Gt CO₂.
By 2050, this could increase to 3.4–4.0 Gt CO₂.
In 2050, circularity could abate up to 75% of the built environment’s embodied carbon emissions.

Economic Value Gains

Annual net profit gains could reach $31–46 billion by 2030 and $234–360 billion by 2050.
Recirculation of materials and minerals is the largest contributor to net value gain, with estimates of $31–48 billion by 2030 and $184–310 billion by 2050.
CCU and CCS also contribute to abatement potential, though their net value gains are initially lower due to high upfront costs.

Material-Specific Opportunities

Material	CO₂ Abatement Potential (2030)	CO₂ Abatement Potential (2050)	Net Value Gain (2030)	Net Value Gain (2050)
Cement and concrete	0.2 Gt CO₂	2.4 Gt CO₂	$31–48 billion	$184–310 billion
Construction steel	0.2–0.3 Gt CO₂	0.6–1 Gt CO₂	$2–4 billion	$34–53 billion
Construction aluminium	0.1–0.2 Gt CO₂	0.3–0.4 Gt CO₂	$6–13 billion	$45–96 billion
Construction plastics	0.1–0.2 Gt CO₂	0.3–0.4 Gt CO₂	$6–13 billion	$45–96 billion
Flat glass	0.1–0.2 Gt CO₂	0.3–0.4 Gt CO₂	$6–13 billion	$45–96 billion
Gypsum wallboards	0.1–0.2 Gt CO₂	0.3–0.4 Gt CO₂	$6–13 billion	$45–96 billion

Circular Strategies

Concrete and cement: Mineralization technologies, smart crushed aggregates, and using concrete waste as an aggregate.
Construction steel: Transition to EAF steel production, increased scrap collection, and design for modularity and disassembly.
Construction aluminium: Increase recycled material use, design for reuse, and adoption of alternative fuels.
Construction plastics: Design for reuse and modularity, increase regrind plastics, and use alternative fuels.
Flat glass: Design for reuse and modularity, increase cullet use.
Gypsum wallboards: Recycling, downcycling, and use of renewable energy in production.

Lighthouses and Collaboration

Lighthouses are essential for scaling circular solutions and demonstrating financial viability.
They catalyse collaboration, advance circular thinking, and disseminate digital technologies.
The industry must identify and promote lighthouses to drive the transition towards a circular built environment.

Conclusion

The transition to a circular built environment is a crucial step in addressing climate change and achieving sustainable growth. It not only reduces CO₂ emissions but also creates substantial economic value. The implementation of circular strategies across different materials is essential for realizing these benefits, and collaboration, innovation, and investment in circular technologies will be key to success.

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