13.2.2.3. How to calculate - organizational carbon footprints

The basic 6 steps required to calculate a carbon footprint for an organization are as follows:

1. Establishment of the assessment boundaries:
   • Organizational
   • Operational
   • Greenhouse gases
2. Collection of data.
3. Calculation of emissions using appropriate emissions factors.
4. Convert usage into CO2 equivalent.
5. Verifying the results (optional).
6. Reporting the carbon footprint.

To calculate an organizational carbon footprint, you should follow six essential steps. First, establish assessment boundaries, which means determining what part of your organization you're measuring (like offices, factories, etc.), what operations to include, and which greenhouse gases to measure. Next, collect data, which involves gathering all necessary information on emissions from various sources within your organization, such as energy use and transportation. The third step is calculating emissions using standard emissions factors or equations. After that, convert your collected data into CO2 equivalents to make them comparable. Optionally, you may verify these results with a third party for credibility. Finally, you'll need to report your findings clearly, providing details about each step you've taken.

Think of calculating your carbon footprint like preparing a big meal. First, you decide what recipe you're following (assessment boundaries). Next, you gather all your ingredients (data collection), then you follow the cooking instructions carefully (calculating emissions) and convert your ingredients into the final meal (CO2 equivalents). If you want to impress your guests, you may taste the dish to make adjustments (verification) before presenting it at the dinner table (reporting).

1. Method definition: You need to have a consistent method to get accurate results – especially if you are going to rely on lots of different people to collect and interpret data. Good sources of standards include:

   • Greenhouse Gas Protocol
   • International Organization for Standardization, ISO 14064

2. Establishment of the assessment boundaries:

   • Organizational boundaries: What parts of the organization are included? This can be complex for large organizations with many subsidiaries, joint ventures or leased assets.
   • Operational boundaries: All scope 1 and scope 2 emissions should be included, but the organization can choose which scope 3 emissions to include. When choosing a boundary try to take account of how your organization works, other reporting periods, legislative requirements, and the practicalities of data collection.

The first step is to define the boundaries of your assessment, which consists of two main components: organizational and operational boundaries. Organizational boundaries specify which parts of your organization will be included in the footprint calculation. For larger organizations, this can be more complicated as it may involve subsidiaries or joint ventures. Next, operational boundaries define which scopes of emissions to measure: scope 1 (direct emissions), scope 2 (indirect emissions from purchased energy), and some scope 3 emissions (like travel or product disposal) at the discretion of the organization. This helps ensure that your carbon footprint is comprehensive and reflects your organization's actual environmental impact.

Imagine you're in charge of planning a big community event. You first need to define your area (organizational boundaries) where the event will be held. Will it be just in the community center, or will it also include the nearby park and parking lot? Then you need to decide on the activities (operational boundaries) that will happen, like setting up booths or arranging for food trucks. What you choose to include influences how the event turns out and the response from the community.

3. Collate data: It is important to collect data as thoroughly and accurately as possible. The main sources of data are usually:
   • Gas and electricity – meter readings or bills (kWh)
   • Other fuels – usage in liters, kWh, MJ, liters
   • Transport – usage by fuel type (if this is not possible estimate it based on the mileage of the vehicles and fuel economy assumptions).

In this step, collecting accurate and comprehensive data is crucial for producing a reliable carbon footprint. Your primary data sources typically include energy consumption from gas and electricity (which can be obtained from utility bills or meter readings), as well as usage of other fuels measured in units like liters or megajoules. For transportation emissions, it's important to record the fuel type used in company vehicles. If you don't have precise figures, you can use estimates based on vehicle mileage and typical fuel efficiency. Accurate data collection lays the groundwork for the calculations that follow.

Think of this step like gathering ingredients before cooking a dish. You need to check your pantry for what you have in stock (gas and electricity usage) and note down any other ingredients you'll need to buy (other fuels). If you’re not sure how much pasta you have, you might measure it out (estimate transport usage based on mileage) to make sure you have enough for everyone. Just as you wouldn't want to start cooking without knowing what you have, you shouldn’t begin your calculations without thorough data.

4. Convert usage into CO2 equivalent: The carbon footprint is measured in tones CO2 equivalent (tCO2e). This is calculated by converting the data you have collected. You should always use conversions from credible sources, see our conversion factor tables. It is important that you identify any data gaps and list the assumptions you have made in calculating the footprint.

To determine the overall carbon footprint, the data you've gathered must be converted into carbon dioxide equivalents (tCO2e). This involves using appropriate conversion factors that relate different greenhouse gases to their climate impact compared to CO2. This step is critical for making all emissions comparable. It is important to ensure the conversions are sourced from reputable organizations to maintain accuracy. Additionally, acknowledging any data gaps or assumptions made during this conversion is essential for transparency and for any possible future audits.

Consider this like translating a recipe from different languages into one language you understand. Each ingredient from different recipes can have different measurements and only by converting them all into a standard unit (like cups or grams) can you accurately follow what you need. Similarly, converting emissions into CO2 equivalents allows you to measure and understand your overall environmental impact in familiar terms.

5. Verifying the results (optional): To add credibility, it makes sense for a third party to verify your carbon footprint. The Carbon Trust Standard is one such company that can do this – as well as helping you to measure, reduce, and communicate your carbon footprint.

Verification is an optional step that can significantly enhance the credibility of your carbon footprint report. In this process, a third-party organization reviews your calculations, methodology, and data collection efforts to ensure accuracy and compliance with industry standards. Utilizing a recognized entity like the Carbon Trust for verification not only reinforces trust in your data but also can provide valuable insights on areas for improvement and strategies for emissions reduction.

Think of this as having a trusted friend taste the dish you prepared before you serve it at a dinner party. Their feedback helps ensure that everything is just right and up to standards. If they find anything that needs adjusting, it's better to know before your guests arrive. Similarly, verification of your carbon data means any errors can be caught early, ensuring your report is trustworthy.

6. Reporting the carbon footprint: Make sure your carbon footprint is presented clearly and honestly. This means providing complete information about each of the steps above, including methods, footprint boundaries, data quality and assumptions. Also - try to keep a consistent approach over different years, explaining any changes in reporting or business structure that might impact the footprint.

The final step involves effectively communicating your organizational carbon footprint assessment in a report. It's paramount to present your findings clearly, including details about your methodology, boundaries you set for the assessment, and the quality of data utilized. Honesty about assumptions, limitations, or changes over reporting periods helps maintain your organization's integrity. Consistency in reporting allows stakeholders to track emissions over time accurately and understand the impact of changes within the organization.

Consider this like presenting a project report to your class. You want your classmates and teacher to understand your work well; therefore, you clearly outline your methods (how you arrived at your conclusions), list what you discovered step by step, and mention if you made any assumptions or encountered obstacles. This clarity builds trust and comprehension in how you prepared your project, just as clear reporting builds understanding of your carbon footprint.

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