13.2. CARBON FOOTPRINT

‘Carbon footprint’ measures the total greenhouse gas emissions caused directly and indirectly by a person, organization, event or product. The footprint considers all six of the Kyoto Protocol greenhouse gases: Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs) and Sulphur hexafluoride (SF6). A carbon footprint is measured in tones of carbon dioxide equivalent (tCO2e). The carbon dioxide equivalent (CO2e) allows the different greenhouse gases to be compared on a like-for-like basis relative to one unit of CO2.

The carbon footprint is a way to quantify the impact of human activities on the environment, specifically in terms of greenhouse gas emissions. This measurement includes direct emissions from personal actions, like driving a car, and indirect emissions from other activities, such as the energy used to produce the food we eat. The carbon footprint also encompasses six significant greenhouse gases, not only carbon dioxide (CO2) but also other gases that contribute to global warming. By expressing the total emissions in terms of carbon dioxide equivalents (CO2e), we can understand the overall impact of various greenhouse gases in a standardized way, making comparisons easier.

Think of the carbon footprint as a 'pollution score' that you accumulate through your daily actions. Just like every purchase you make contributes to your bank account, every activity you engage in – such as using electricity or driving a car – adds to your total carbon score. And just like you can compare bank accounts using a common currency, the carbon emissions from different gases can be converted into a common unit, CO2e, allowing us to measure and understand their combined effects on climate change.

An organizational or business carbon footprint measures the direct and indirect greenhouse gas emissions arising from all of an organization’s activities. The Greenhouse Gas Protocol standard is commonly used to categorize an organization’s emissions into 3 groups or ‘scopes’: • Scope 1 - Direct emissions • Scope 2 - Indirect emissions: electricity and heat • Scope 3 - Indirect emissions: other Under the Greenhouse Gas Protocol, an organization must include scope 1 and 2 emissions within its carbon footprint.

An organizational carbon footprint is a comprehensive measure of all greenhouse gas emissions linked to an organization. It breaks emissions into three scopes to make tracking easier: Scope 1 includes direct emissions from owned sources (like company cars), Scope 2 covers indirect emissions from purchased energy (like electricity consumption), and Scope 3 encompasses all other indirect emissions from various activities not directly controlled by the organization, such as business travel or waste disposal. By following the Greenhouse Gas Protocol, organizations can systematically assess their carbon footprint, focusing on areas they can manage directly and track over time.

Imagine running a restaurant. The energy used to cook meals and heat the building is in Scope 1 (direct emissions) because you control it. The electricity you buy to power your kitchen (Scope 2) is also part of your footprint because it's indirectly related to your operations. Then consider the food you source from suppliers or the waste generated; these would be Scope 3 emissions, which you cannot control directly but can influence through sustainable practices, like choosing local suppliers or reducing food waste.

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 effectively calculate a carbon footprint, organizations should follow a systematic approach through six key steps. First, they need to define the boundaries of what will be included in the assessment, considering what parts of the organization and which emissions (Scopes 1, 2, and possibly 3) are relevant. Next, data must be collected from resources like energy bills and transportation records. The actual emissions are then calculated based on standardized emissions factors, and these figures need to be converted to CO2 equivalents to reflect their climate impact accurately. Optional verification can enhance credibility, paving the way for transparent reporting of the carbon footprint, which can be used for sustainability initiatives and public accountability.

Think of calculating a carbon footprint like preparing a complex dish with multiple ingredients. First, you decide what ingredients (boundaries) you'll use, then you gather your ingredients (collect data). Next, you measure each one (calculate emissions) and combine them to understand the dish's overall flavor (convert to CO2 equivalent). If you're unsure about your proportions, you might ask a chef to double-check your recipe (verification). Finally, you present your dish at a dinner party (reporting the carbon footprint), letting everyone know how you made it and why it matters!

A product carbon footprint measures the greenhouse gas emissions at each stage of the product’s life. This includes: • Extraction, production and transportation of raw materials • Manufacture or service provision • Distribution • End-use • Disposal/recycling.

The product carbon footprint encompasses the total greenhouse gas emissions associated with a product throughout its entire lifecycle, from raw material extraction to final disposal or recycling. This lifecycle perspective means that emissions from all stages, such as production, transportation, and usage, are considered. By assessing each of these life stages, organizations can identify where emissions occur and consider opportunities for reduction – whether that’s choosing sustainable materials, improving manufacturing efficiency, or enhancing recycling efforts at the end stage.

Consider a smartphone as an example of a product carbon footprint. The emissions begin with the extraction of raw materials like metals (extraction), continue during its manufacturing in factories (production), and include the transportation to retailers (distribution). When you use your phone (end-use), it consumes electricity, and finally, when the phone reaches the end of its life, how it’s disposed of or recycled will also generate emissions. By understanding this entire journey, manufacturers can look for ways to minimize the carbon footprint, like opting for recycled materials or creating easier recycling processes.

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