Shifting Boundaries: Critical Differences Between Calculating Carbon Footprints for Cities and Corporations

City-Company Carbon Gap

When it comes to calculating greenhouse gas emissions, the method used depends entirely on "what" you are measuring. A company's carbon footprint and a city's carbon inventory, while based on the same basic principles, are two very different worlds in practice. The globally accepted GPC Standard (Global Protocol for Community-Scale Greenhouse Gas Emission Inventories) was developed to clarify this distinction. So what are the key differences between the GPC Standard and corporate carbon footprint calculations (GHG Protocol Corporate Standard) and how do these differences shape climate action?

Two Different Branches from the Same Root

Let's start with the similarity: Both the GPC and the Corporate Standard derive from the basic "scopes" framework of the GHG Protocol. Both categorize emissions as direct and indirect. But the similarity ends there, because the "boundaries" they focus on are completely different.

1. Focus Area: Operational Boundaries versus Geographical Boundaries

The key difference is where emissions are sought:

• Corporate Standard (For Companies): Focus is on operational limits. It looks at emissions from sources owned or controlled by a company (e.g. company vehicles, factories, offices).
• GPC Standard (For Cities): The focus is on geographical boundaries. It considers all activities within a given administrative boundary (city, district, town, etc.) on a community-scale.

So, while a company is only responsible for "its" smokestack, a city is responsible for the homes, traffic, waste and industry within its borders, i.e. the activities of "everyone" in that geography.

2. Major Change in Scope 1 Definition

the definition of "Scope 1" (Direct Emissions) changes radically between the two standards:

• Companies: Direct emissions only from sources owned or controlled by the company (e.g. company-owned generator, company-owned vehicles).
• Cities (GPC): Covers all emission sources within the geographical boundary of the city. Heating of all buildings (including private property) in the city, exhaust gases from all vehicles (private or public) within the boundaries are considered as Scope 1.

3. User and Purpose Difference

The audience and the purpose served by these two standards also differ:

• Corporate Standard: Used by individual businesses, companies and organizations. Its purpose is to report corporate responsibility, manage risks and meet stakeholder expectations.
• GPC Standard: Used by cities, local governments and states. Its main purpose is to identify urban mitigation actions, set targets and combine this data with national inventories.

Conclusion Not Mixing Apples and Pears

The difference between calculating the electricity of a municipal building (the Corporate Standard) and the electricity of the entire city managed by that municipality (the GPC) is a difference in methodology, not just volume. The GPC is designed to manage the complexity of cities and community-wide interactions, while the Corporate Standard focuses on organizational ownership. Cities should therefore use the GPC standard designed specifically for them, not the corporate standard, to tackle climate change.