Measuring the carbon footprint of your e-waste activities is the essential first step toward managing and reducing it. Without accurate measurement, you cannot set meaningful targets, track progress, or report credibly to stakeholders. The good news is that measuring your e-waste carbon footprint does not require sophisticated modelling. With the right data sources and a clear methodology, most organisations can produce a reasonable estimate and refine it over time.
Defining the Boundary
Before you start measuring, define what you are including. A comprehensive e-waste carbon footprint covers the embodied carbon of IT equipment purchased (the manufacturing emissions you are responsible for through your procurement), the operational carbon of IT equipment during use (the electricity consumed), and the end-of-life carbon from collecting, transporting, and processing retired equipment, net of any avoided emissions from refurbishment and materials recovery.
Most organisations start with end-of-life emissions and avoidance because this is where ITAD decisions have the most direct impact and where the data is most readily available from your ITAD provider. Over time, you can expand the boundary to include procurement and use-phase emissions for a complete lifecycle picture.
Step 1: Inventory Your E-Waste
The foundation of any e-waste carbon measurement is knowing what equipment you are retiring. Compile an inventory of all IT equipment disposed of during the reporting period, including the number and type of each device (laptops, desktops, monitors, servers, networking equipment, peripherals), the weight of equipment processed (your ITAD provider should supply this), and the disposition method for each item (refurbished, recycled, destroyed).
Your IT asset register is the primary data source. If your asset register is not detailed enough, your ITAD provider’s collection and processing reports should provide the necessary information.
Step 2: Calculate End-of-Life Emissions
End-of-life emissions come from two main activities. Transportation emissions are calculated by multiplying the distance from your premises to the processing facility by the weight of equipment transported, using the appropriate emission factor for the vehicle type. Your ITAD provider can supply the distance and vehicle information, and the Australian National Greenhouse Accounts Factors provide emission factors for different vehicle types.
Processing emissions cover the energy used in data destruction, mechanical processing, and materials recovery. If your ITAD provider can supply facility-specific emission data, use that. If not, industry average emission factors for e-waste processing can be used as a proxy. A reasonable estimate for mechanical recycling processing is 100 to 300 kg CO2e per tonne of e-waste processed.
Step 3: Calculate Avoided Emissions
Avoided emissions are the positive side of your e-waste carbon ledger. For refurbished equipment, the avoided emissions equal the embodied carbon of the new device that would have been purchased minus the emissions from the refurbishment process. Using conservative estimates, each refurbished laptop avoids approximately 270 to 350 kg CO2e, and each refurbished server avoids 800 to 3,500 kg CO2e depending on configuration.
For recycled materials, the avoided emissions equal the difference between the emissions from primary production of those materials and the emissions from the recycling process. Your ITAD provider should be able to supply materials recovery data (weight of metals, plastics, and other materials recovered) that allows this calculation.
Step 4: Calculate Procurement Emissions
If you are expanding your boundary to include procurement emissions, you need the embodied carbon data for each piece of IT equipment purchased during the reporting period. Sources include manufacturer environmental product declarations (the most accurate), manufacturer sustainability reports (which may provide product-category averages), lifecycle assessment databases (such as ecoinvent), and industry average figures from published research.
Multiply the embodied carbon per device by the number of devices purchased to get your total procurement carbon footprint. This figure sits in your Scope 3 Category 1 (Purchased Goods and Services) or Category 2 (Capital Goods) depending on your accounting treatment.
Step 5: Calculate Use-Phase Emissions
Use-phase emissions are a function of each device’s power consumption, operating hours, and the carbon intensity of your electricity supply. For a business laptop used eight hours per day, 250 days per year, consuming an average of 30 watts, annual electricity consumption is approximately 60 kWh. Multiplied by the relevant grid emission factor (approximately 0.7 kg CO2e per kWh for the Australian average, varying by state), this generates roughly 42 kg CO2e per year.
For an organisation with 500 laptops, annual use-phase emissions would be approximately 21 tonnes CO2e. This is a Scope 2 emission.
Bringing It Together
A complete e-waste carbon footprint summary might look like this for an organisation retiring 300 IT assets annually. Procurement emissions (embodied carbon of new purchases) might total 105 tonnes CO2e. Use-phase emissions across the fleet might total 25 tonnes CO2e. End-of-life processing emissions (transport and processing) might total 5 tonnes CO2e. And avoided emissions from refurbishment and recycling might total 65 tonnes CO2e.
The net carbon position depends on how you frame it. Your gross emissions from the IT lifecycle are the sum of procurement, use, and processing. Your avoided emissions represent the positive environmental contribution of your ITAD programme. The two should be reported separately, not netted off against each other.
Improving Accuracy Over Time
Your first measurement will likely rely on estimates and averages. That is fine. The goal is to establish a baseline and improve accuracy year on year. In subsequent years, you can replace industry averages with provider-specific data, obtain product-specific embodied carbon data rather than category averages, improve the granularity of your inventory data, and refine your emission factors as better data becomes available.
For detailed guidance on the reporting side, see our guide on CO2e avoidance reporting for ITAD. For the broader context of measuring your IT disposal environmental impact, our environmental impact measurement guide covers metrics beyond carbon.
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