What is a Life Cycle Assessment?
Life cycle assessment (also known as LCA) is a tool that measures a product's or service's environmental impact during its entire life cycle.
LCA measures a wide range of environmental impacts such as:
• Greenhouse gas emissions (including but not limited to embodied carbon)
• Energy consumption
• Water usage
• Air and water pollution
• Solid waste generation
• Impact on biodiversity
• Human health impacts
The purpose of life cycle assessments is to guide lower carbon design alternatives.
We can’t talk about life cycle assessments without a lesson on carbon.
In construction, we measure carbon in 2 ways: “embodied” and “operational.”
Together, they equal “whole life carbon.”
Life cycle assessments evaluate different strategies to help architects and developers make informed decisions with the goal of reducing a building’s embodied carbon.
Whether it's selecting materials for manufacturing, making policy regulations, or choosing between product alternatives, LCAs provide data-driven insights.
Let’s focus on the embodied.
Embodied carbon refers to all greenhouse gas (ghg) emissions during the whole life cycle of a building, as illustrated in the images below. This includes:
Raw material resource extraction
Transportation to the construction site
Maintaining, repairing, and refurbishing the building
Demolition the building
Source: oneclick LCA
Source: World Green Building Council
Drawing by Steven Biersteker “The Carbon Architect”
Conduct LCA for LEED
For new construction, LEED’s LCA evaluates only the structure and enclosure materials of the building for 6 environmental impacts:
Global Warming Potential (GWP): Greenhouse gases referring to the embodied carbon, measured in kg CO₂e
Depletion of the stratospheric ozone layer: measured in kg CFC-11e;
Acidification of land and water sources: measured in moles H+ or kg SO2e;
Eutrophication: measured in kg nitrogen eq or kg phosphate eq
Formation of tropospheric ozone: measured in kg NOx, kg O₃ eq, or kg ethene
Depletion of nonrenewable energy resources: measured in MJ using CML / depletion of fossil fuels in TRACI
If using the LEED v4 Building Design and Construction (BD+C) rating, LCAs earn 1 credit for Building Life-Cycle Impact Reduction.
GAIA performs a life cycle assessment on all LEED projects.
Conduct LCA for GRESB
The GRESB Development framework awards points for life cycle assessments (DMA2.1) based on percentage of projects that have conducted LCAs.
More reasons for the value of conducting a life cycle assessment:
Reducing Costs: By identifying inefficient or wasteful stages in a product's life cycle, businesses can potentially reduce costs through optimization.
Resource Optimization: LCA can spotlight opportunities to conserve resources, reduce waste, and improve overall efficiency.
Competitive Advantage: Demonstrating a commitment to sustainability can offer businesses a competitive edge, especially in markets where consumers prioritize eco-friendly products.
Regulatory Compliance and Reporting: As environmental regulations become stricter, many industries are now required to report their environmental impacts. LCA can aid in meeting these requirements.
Enhancing Brand Image and Reputation: Undertaking LCAs and acting upon their findings can boost a company's reputation as environmentally responsible.
Risk Management: Identifying potential environmental impacts can help companies anticipate and mitigate risks, especially those linked to resource scarcity, regulatory changes, or public perception.
Supporting Marketing Claims: Companies that want to make green or eco-friendly claims can back up such statements with data from LCAs.
Innovation Drive: The insights from an LCA can spur innovation, leading to the development of new, sustainability-driven materials, processes, or products.
Global Standards Alignment: LCA is a globally recognized methodology, allowing companies to align their processes with international standards, facilitating trade and global operations.
In essence, life cycle assessments are not just about understanding environmental impacts but also about integrating sustainability into core business strategies and decision-making processes and fostering a culture of continuous improvement.
Finally, why should we even care about embodied carbon?
Addressing embodied carbon is crucial because, unlike operational carbon, once embodied carbon is "locked in" during construction, it cannot be undone or reduced over the building's lifecycle.
✅ Sustainability: To be a responsible steward, which meets growing market and tenant demands.
✅ Regulation: To comply with and be proactive with evolving policies.
✅ Value: Lower embodied carbon boosts property value and attracts investment.
✅ ESG Reporting: To align with GRESB, TCFD, SBTi frameworks and others.
GAIA’s Role
GAIA has experience conducting over 300 life cycle assessments. We guide our clients to understand evolving regulations, ensuring compliance and decarbonizing their portfolios.
Projects in California?
Starting July 1, 2024, large-scale commercial developments are required to conduct a life cycle assessment.
