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Carbon Emissions 101: Breaking Down Embodied, Operational, and More

Understanding embodied and operational carbon, their impacts, and actionable strategies for reducing emissions effectively.

Ava Montini

Dec 11, 2024

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Carbon emissions touch every aspect of our lives—from the buildings we live into the devices we use. But, not all emissions are created equal.


While operational emissions from energy use often grab attention, the hidden impact of embodied carbon in materials is just as significant. In this blog, we’ll break down the difference between embodied and operational carbon and explore actionable ways to reduce emissions for a sustainable future.


What is Carbon and Why Does It Matter?

Carbon, in the context of climate change, refers to the greenhouse gases (GHGs) emitted into the atmosphere, primarily carbon dioxide (CO2). These emissions result from activities such as burning fossil fuels, deforestation, and industrial processes. GHGs trap heat in the atmosphere, contributing to global warming and its associated impacts, including rising sea levels, extreme weather events, and biodiversity loss. Humans emitted 36.8 billion metric tons of CO2 in 2022 alone, marking a new record for global emissions. A significant portion of these emissions stems from the energy sector, which accounts for 73% of global emissions, with electricity and heat production making up 42% of that share.





Deforestation and forest degradation account for approximately 11% of global carbon emissions annually. The loss of forests not only releases stored carbon but also reduces the planet’s ability to sequester new carbon. This dual impact underscores the urgent need for forest preservation and reforestation initiatives. To meet the Intergovernmental Panel on Climate Change (IPCC) goal of limiting global warming to 1.5°C, global CO2 emissions must decline by about 45% from 2010 levels by 2030 and reach net zero by 2050.


Reducing carbon emissions is essential to achieving global climate goals, such as the Paris Agreement's target of limiting global warming to 1.5°C. This requires a comprehensive understanding of the different categories of carbon emissions and how they interconnect, paving the way for effective mitigation strategies.


To better understand how carbon emissions are generated, let’s examine two key contributors: embodied and operational carbon.


Embodied Carbon

The Hidden Footprint


Embodied carbon refers to the CO2 emissions associated with the production, transportation, and construction of materials and goods. Unlike operational carbon, which occurs during the use phase of a product or building, embodied carbon is "locked in" from the start.


Lifecycle Stage

Embodied carbon includes emissions from raw material extraction, manufacturing, and supply chain logistics. It is typically fixed and cannot be reduced once the product is created.


Primary Sectors Affected

Construction, manufacturing, and technology production.


Why It Matters

Embodied carbon often represents a significant share of total emissions, especially in industries reliant on energy-intensive materials. The World Green Building Council reports that embodied carbon contributes up to 50% of a building’s total lifecycle emissions.


  • Skanska, a global construction firm, has implemented low-carbon concrete alternatives and tracked embodied carbon through digital tools to align with its net-zero goals.

  • Apple continues to prioritize energy efficiency by optimizing HVAC systems across its facilities. By implementing low-pressure HVAC filters and energy-efficient solutions, Apple reduces the energy required for ventilation, cutting operational carbon emissions. These upgrades contribute to Apple’s commitment to becoming carbon neutral across its entire value chain by 2030.


Actionable Steps

  1. Use low-carbon materials such as recycled steel, bamboo, or cross-laminated timber.

  2. Conduct lifecycle assessments (LCAs) to identify high-impact areas.

  3. Foster partnerships with suppliers that prioritize sustainability.

  4. Incorporate modular designs to reduce material waste and embodied carbon.


Operational Carbon

The Active Emissions


Operational carbon refers to the emissions generated during the use phase of a product or building. These emissions result primarily from energy consumption for heating, cooling, lighting, and operating machinery.


Lifecycle Stage

Operational carbon is ongoing and occurs throughout the usable life of a building, product, or system.


Energy Sources

Fossil fuels, grid electricity, and renewable energy significantly influence operational carbon levels.


Major Contributors

Commercial buildings, data centers, and transportation systems are key sources of operational carbon.


Why It Matters

Operational carbon is the dominant contributor to global emissions in many industries. The International Energy Agency (IEA) notes that buildings account for approximately 30% of global final energy consumption and 26% of global energy-related CO₂ emissions.


A substantial share of this energy use is attributed to heating and cooling systems. Specifically, space heating and cooling, along with hot water, are estimated to account for roughly half of global energy consumption in buildings. This highlights the significant impact of heating and cooling systems on building energy consumption and emissions.


Actionable Steps

  1. Transition to renewable energy sources such as solar or wind power.

  2. Implement energy-efficient appliances, HVAC systems, and LED lighting.

  3. Leverage building management systems (BMS) to optimize energy use in real time.

  4. Set energy benchmarks and continuously monitor performance.


Beyond Embodied and Operational Carbon: Other Key Terms


1. Carbon Offset

Refers to compensating for emissions by investing in projects that reduce or remove CO2 from the atmosphere, such as reforestation or renewable energy initiatives.

  • Delta Airlines invests in carbon offset programs, including reforestation projects in Kenya, as part of its commitment to becoming the first carbon-neutral airline.


2. Carbon Intensity

Measures the amount of CO2 emitted per unit of energy or production. This metric helps businesses evaluate and improve efficiency.

  • Tesla measures the carbon intensity of its manufacturing processes to ensure sustainability across its electric vehicle lifecycle.


3. Sequestered Carbon

Describes carbon captured and stored in natural or artificial reservoirs. Forests, soil, and biochar are examples of natural carbon sinks.


4. Scope 1, 2, and 3 Emissions (from the Greenhouse Gas Protocol)

Scope 1

Direct emissions from company-owned resources.


Scope 2

Indirect emissions from purchased energy.


Scope 3

Emissions from a company’s value chain, including suppliers and end-users.

Strategies for a Holistic Carbon Reduction Plan

To create impactful carbon reduction strategies, organizations must address both embodied and operational carbon and then their broader carbon footprint.


Here are some tips:

  1. Adopt Lifecycle Assessments (LCAs): Evaluate the total carbon impact of products or projects from cradle to grave.

  2. Invest in Innovation: Support research and development for low-carbon technologies, such as carbon capture and storage (CCS).

  3. Set Science-Based Targets: Align emission reduction goals with the latest climate science.

  4. Engage Stakeholders: Collaborate with suppliers, customers, and employees to foster a culture of sustainability.

  5. Leverage Digital Solutions: Use AI and IoT technologies to monitor and optimize energy usage, reducing operational carbon.

  6. Adopt Circular Economy Practices: Design products for reuse and recycling to minimize waste and embodied carbon.


Embodied carbon reveals the hidden costs of our built environment, while operational carbon highlights ongoing emissions challenges. By taking a lifecycle approach and addressing emissions at every stage, we can pave the way for a sustainable, net-zero future.


And business leaders play a pivotal role in this transition. Prioritizing sustainability in supply chains, investing in renewable energy, and adopting innovative practices allows companies to drive change that benefits both the planet and their bottom line.


As awareness grows, the responsibility to act lies with every sector of society. From adopting renewable energy solutions to rethinking material choices, the path forward demands innovation, collaboration, and a commitment to reducing carbon footprints.

Writer's pictureJennifer Crowley
Jul 28, 2023

MERV 13 vs HEPA Filter: How Are They Different?

Cropped images of a pleated filter (MEV 13) and a HEPA filter, one on top of the other, to create one image
Both MERV 13 and HEPA filters are designed to remove pollutants from the air; however, there are some key differences between them including cost, fit and airflow.

Air filters are a vital component in maintaining good indoor air quality. Two of the most commonly used air filters are MERV 13 filters and HEPA filters. Both types of filters are designed to remove pollutants from the air; however, there are some key differences between them.

Illustration comparing the particle capture of MERV , 10 and 13 filters
The higher a filter’s MERV rating, the more effective it is at capturing airborne particles.

What are MERV 13 filters?

All traditional air filters are differentiated according to their MERV (Minimum Efficiency Reporting Value) rating. The higher a filter’s MERV rating, the more effective it is at capturing airborne particles. MERV 13 and below are considered HVAC-system-grade filters for residential, commercial and general hospital use.


MERV 13 filters can filter particles closer to 0.3 microns in size, which includes contaminants such as pollen, mould, dust, bacteria, pet dander, smoke and virus carriers. MERV 13 filters are typically used in residential and commercial HVAC systems to improve indoor air quality.


What are HEPA filters?

On the other hand, HEPA filters are considered the most efficient air filters available. HEPA stands for High-Efficiency Particulate Air and has a rating of MERV 17 or higher. HEPA filters are designed to remove 99.97% of particles that are 0.3 microns or larger in size; This includes particles such as smoke, bacteria, and viruses.


Since HEPA filters are so efficient, they cause a higher pressure drop than filters with MERV ratings. Given their high efficiency, HEPA filters are best suited for rooms where air quality is a concern, such as in hospitals, laboratories, and cleanrooms.


Many ventilation systems are not designed for HEPA, but these filters are available as portable air cleaners or vacuum cleaners and can be used in homes to improve indoor air quality, particularly for people with allergies or respiratory issues.


MERV 13 vs HEPA Filter: How Are They Different?

14 Pleated HVAC filters standing side by side as if on a bookshelf
MERV 13 filters can capture particles as small as 0.3 microns.

Pros of MERV 13 Filters:

  1. Cost: Affordable and easy to find.

  2. High Efficiency: MERV 13 filters can capture particles as small as 0.3 microns, making them highly effective at removing pollutants such as dust, pet dander, pollen, and even some bacteria and viruses from the air.


Cons of MERV 13 Filters:

  1. Filter Efficiency: Not as effective as HEPA filters in removing the smallest and most harmful particles.

  2. Maintenance: MERV 13 filters may need to be replaced more frequently than lower MERV-rated filters, which can add to the overall cost and maintenance of the HVAC system.

  3. Compatibility: MERV 13 filters may not be compatible with all HVAC systems, and using a filter that is too efficient for a system can cause damage. Before using a MERV 13 filter, it is important to check if the HVAC system can handle the filter’s efficiency and pressure drop.

Photo of a free standing HEPA Filter
HEPA filters are extremely effective at removing pollutants, including smoke, bacteria, and viruses.

Pros of HEPA Filters:

  1. High efficiency: HEPA filters are highly efficient at trapping small particles, such as dust, pollen, and pet dander. Extremely effective at removing pollutants, including smoke, bacteria, and viruses.

  2. Long lifespan: HEPA filters are designed to last a long time, so they do not need to be replaced as frequently as other filters.



Cons of using a HEPA filter in an HVAC system include:

  1. High cost: HEPA filters can be more expensive than other types of filters, which can make them a less cost-effective option for some people.

  2. Decreased airflow: HEPA filters can reduce airflow through a standard HVAC system, which can make it less energy efficient and increase the amount of time it takes to heat or cool a room.

  3. Need for professional installation: HEPA filters are typically larger and more complex than other types of filters, which means they may need to be installed by a professional.


In conclusion, both MERV 13 and HEPA filters effectively improve indoor air quality, but they have different pros and cons depending on the setting and the level of air purity required. MERV 13 filters are more affordable and easy to find and effectively remove a wide range of pollutants. HEPA filters are extremely effective at removing pollutants, but they are more expensive and can be more difficult to find.


It’s also important to consult a professional to determine the most appropriate filter for your setting, MERV 13 vs HEPA, as the filter type and frequency of replacement can vary depending on the size and usage of the space, as well as the type of pollutants present in the air.

Explore expert insights, stay up to date with industry events, and gain a deeper understanding of the cutting-edge developments that are revolutionizing the indoor air quality landscape within Blade Air's comprehensive Insights Hub.

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