What are Scope 3 Emissions?

Most founders start by looking at their monthly recurring revenue or their burn rate. These are the immediate signals of business health. However, as the global economy shifts toward transparency and sustainability, a new set of numbers is becoming just as vital for those who want to build something that lasts. These numbers fall under the umbrella of carbon accounting. Specifically, we are talking about Scope 3 emissions.

Scope 3 emissions represent the greenhouse gas emissions that occur outside of your immediate business operations but within your entire value chain. If you are building a startup, you likely already understand Scope 1 and Scope 2. Scope 1 involves the fuel you burn directly, such as gas for a company vehicle. Scope 2 covers the electricity or heating you purchase for your office. Scope 3 is everything else. It is the footprint of your suppliers, the travel your employees undertake, and the way your customers use your products.

For most organizations, Scope 3 is the largest portion of their total carbon footprint. It often accounts for more than 70 percent of total emissions. Because these emissions are not under your direct control, they are the hardest to measure and the most difficult to reduce. For an entrepreneur, ignoring this category is a risk. It is the invisible weight of your company’s environmental impact.

To get a handle on Scope 3, you have to look at the value chain in two directions: upstream and downstream. Upstream emissions are everything that happens to bring your product or service to life before it reaches your door. This includes the extraction of raw materials, the manufacturing of components by third parties, and the transportation of those goods to your warehouse. It also includes daily operations like employee commuting and business travel.

Downstream emissions occur after your product leaves your control. If you sell a physical device, the energy your customer uses to power that device is a downstream Scope 3 emission. When that device eventually reaches the end of its life and is thrown away or recycled, the emissions from that disposal process also belong to your Scope 3 profile. For a software company, downstream emissions might include the energy consumed by the end user’s hardware when they run your application.

The Greenhouse Gas Protocol, which is the standard for carbon accounting, breaks these down into 15 distinct categories. These categories provide a framework for founders to start auditing their impact. They include things like purchased goods and services, capital goods, fuel and energy related activities not included in Scope 1 or 2, and even investments. The goal is to create a complete picture of the atmospheric cost of doing business.

It is helpful to compare these scopes to understand where your leverage lies as a founder. Scope 1 and 2 are about operational efficiency. You can choose to buy an electric vehicle or switch to a renewable energy provider for your office. You have the receipts and the utility bills to prove your impact. These are direct points of control.

Scope 3 is about influence and partnership. You do not own the factory in another country that makes your parts, but you choose to buy from them. You do not own the airline your sales team uses, but you decide how often they fly. In this sense, Scope 3 is a map of your business relationships. While Scope 1 and 2 are relatively easy to calculate with high precision, Scope 3 often relies on estimates and industry averages.

This lack of precision is where many founders get stuck. However, the distinction is vital for strategy. If a startup claims to be carbon neutral but only accounts for Scope 1 and 2, they are often ignoring the vast majority of their actual impact. A truly remarkable and solid company looks at the whole picture, even when the data is messy. Understanding the difference helps you decide where to spend your limited time and resources.

How does this look in practice for different types of businesses? Consider a direct to consumer physical goods startup. Your Scope 3 emissions are dominated by the materials you buy. If you switch from virgin plastic to recycled materials, you are directly reducing your Scope 3 upstream emissions. You are also responsible for the shipping emissions when that product goes to the customer. If you choose sea freight over air freight, you change the Scope 3 profile of your company.

Now consider a software as a service startup. You might think your footprint is zero because you do not have a factory. This is not the case. Your Scope 3 emissions include the data centers you rent from companies like Amazon Web Services or Google Cloud. It includes the laptops your developers use and the servers that host your database. Even though you do not own the servers, your demand for their services causes emissions.

In both scenarios, the data is used to make decisions. If an investor asks about your long term climate risk, you can point to your Scope 3 analysis. It shows that you understand your dependencies. It shows that you are prepared for a future where carbon may be taxed or where customers demand total transparency about the products they buy.

Despite the push for transparency, we are currently in a period of significant uncertainty regarding carbon data. One of the biggest questions involves data integrity. Most companies currently use spend-based modeling to estimate Scope 3 emissions. This means they take the amount of money they spent with a supplier and multiply it by an industry average emission factor. This is a crude instrument. It does not account for a supplier who is actually more efficient than the average.

There is also the problem of double counting. If Company A sells a part to Company B, that part’s production is Scope 1 for Company A and Scope 3 for Company B. When we look at the global economy, how do we ensure we are not overstating or understating the total impact? Researchers and accountants are still debating the best ways to harmonize this data across international borders.

As a founder, you have to navigate these unknowns. You must ask: How much should I trust this supplier’s data? What happens if the industry standards for measurement change next year? By surfacing these questions, you can build a more resilient business. You start to see your supply chain not just as a cost center, but as a complex web of environmental inputs. Building something that lasts requires looking at these complexities rather than ignoring them because they are difficult to measure. We do not yet have all the answers for perfect carbon accounting, but the work of tracking Scope 3 is a step toward building a business with real, documented value.