Embodied Carbon: The Emissions in Everything We Use.

As a critical component of a product's environmental footprint, embodied carbon encompasses all greenhouse gas (GHG) emissions generated throughout a product's lifecycle, from its raw material phase to its intended use or operation.

Understanding and quantifying embodied carbon is crucial for a holistic approach to sustainability. It brings forth the environmental impacts of material choices, design decisions and supply chain logistics, encouraging industries to look for low-carbon materials, optimise manufacturing processes and design long-lasting and easily recyclable products to reduce their environmental burden.

What is the scope of embodied carbon?

Embodied carbon is broad, encompassing emissions from the entire life cycle before first use. This includes:

• • Raw Material Extraction: Energy and GHGs from mining, harvesting, or extracting virgin resources.
  • Processing: Emissions from refining and converting raw materials (e.g., smelting, lumber conversion).
  • Manufacturing: Factory energy use, process emissions, and waste from product fabrication.
  • Assembly: Energy and emissions from combining components into the final product.
  • Transport: Emissions from moving materials and products across the entire supply chain (land, sea, air).
  • Maintenance: Emissions from upkeep or treatment of a product before its first use (e.g., protective coatings).
  • Disposal or Recycling: Emissions and energy from managing manufacturing waste or initial recycling efforts.

Embodied Carbon Vs. Operational Carbon

Embodied carbon refers to the greenhouse gas emissions associated with the materials and processes used to manufacture, transport, install, maintain, and eventually dispose of an asset, from raw material extraction through to end-of-life.

By contrast, operational carbon is the emissions generated during the use phase of that asset, for example, the energy consumed to heat, cool, light, or power a building, vehicle, or piece of equipment. Traditionally, organisations have focused on operational carbon because it is easier to meter and is directly linked to energy consumption.

However, as grids decarbonise and operational emissions fall, embodied carbon can represent a growing share of total lifecycle impact. For businesses developing products, infrastructure or buildings, managing climate risk now requires considering both: reducing operational energy demand and decarbonising the supply chain, materials, and construction or manufacturing processes that drive embodied emissions.

Why Embodied Carbon Matters?

• • A Substantial Global Share: Embodied carbon is a substantial portion of global CO₂ emissions. The construction sector alone accounts for nearly 11% of all global carbon dioxide emissions, per the World Green Building Council's 2023 report, highlighting its critical role in meeting climate targets.
  • Expanding Policy Frameworks: Governments and regulators are increasingly recognising embodied carbon. For example, the UK's Net Zero Strategy and the updated Environmental Reporting Guidelines (2024) now urge businesses to include embodied emissions in their comprehensive supply-chain assessments, reflecting a shift toward holistic environmental accounting.
  • Growing corporate responsibility and investor expectations: Investors and clients demand greater lifecycle transparency beyond regulations, increasingly viewing it as essential to ESG reporting. Companies with a clear embodied carbon reduction strategy are favoured.

Embodied Carbon and the Circular Economy

Measuring and understanding embodied carbon is not just about reporting; it's a powerful enabler of the circular economy. By quantifying the carbon footprint of materials, businesses are better equipped to make informed decisions that prioritise reuse, recycling, and overall resource efficiency. This includes:

• • Material Selection: Choosing low-carbon materials or materials with recycled content.
  • Design for Disassembly: Designing buildings and products that can be easily dismantled and their components reused or recycled at the end of their life.
  • Waste Reduction: Minimising waste throughout the construction process.
  • Optimised Resource Use: Making the most of existing resources and extending their lifespan.

Addressing embodied carbon is no longer a niche concern but a mainstream imperative. Its significant contribution to global emissions, coupled with evolving policy landscapes and increasing corporate and investor expectations, highlights its central role in achieving a truly sustainable built environment and advancing circular economy principles. Making it one of the fastest ways to cut emissions in supply chains that are otherwise difficult to decarbonise.

How Embodied Carbon Is Calculated

Embodied carbon is usually expressed as kgCO₂e per unit of material or product and assessed through Life Cycle Assessment (LCA) following standards such as:

• • BS EN 15804: Environmental product declarations for construction products.
  • ISO 14067: Carbon footprint of products.
  • PAS 2050: Assessment of life cycle greenhouse gas emissions.

The calculation involves four stages:

1. 1. Material extraction and processing
   2. Transport and manufacturing
   3. Use and maintenance (if applicable)
   4. End-of-life (recycling, disposal, or recovery)

Each stage quantifies energy use and emission factors, creating a cradle-to-grave footprint.