How to Measure Scope 3 Emissions: Challenges and Strategies

If you have started reporting the environmental, social, and governance performance of your organization, you would have surely covered Scope 1 and Scope 2 emissions by now. Factory emissions, power consumption, and fleet emissions. These things seem measurable to you. Enter Scope 3 into the equation, and suddenly you find yourself in a tough situation. In fact, the real emissions occur at the Scope 3 level for any organization. But what makes it difficult is the collection of accurate data from an operational system that was never designed for carbon emissions reporting to begin with.

A Quick Understanding of Scope 3

Scope 1 covers direct emissions from assets your company owns or controls. Scope 2 deals with indirect emissions caused by the use of purchased energy. Scope 3 refers to everything else related to your business activities, including emissions from suppliers, transportation, staff travel, waste management, product use, and disposal at the end of life cycle. In most organizations, Scope 3 accounts for the biggest portion of greenhouse gas emissions. It is reported by the Carbon Disclosure Project that Scope 3 emissions are usually over 11 times greater than those covered by Scope 1 and Scope 2 emissions put together.

Why Scope 3 Is Difficult to Measure

This is a question that goes beyond calculations. It relates to data management. Very few firms control processes that result in Scope 3 emissions. The suppliers themselves may have poor tracking. Different logistics providers can use different means to report. The various divisions inside an organization keep their own data, and no one keeps all data together. For instance, the procurement division has data on suppliers. The finance division has information on expenditures. The operations department handles transport and goods movement.  None of these systems were originally designed to work together for emissions reporting. This creates fragmented visibility.

The other issue is methodology. Some corporations apply spend-based approach, which involves multiplication of financial information by emissions factors. Other organizations utilize activity-based approaches, which involve real operations data. Supplier-specific disclosure only makes things more diverse. The end result is that two firms can come up with very different results for similar activities.

Another type of emission calculation that is widely used by businesses is the estimation based on industry averages. While this can be useful for locating high-emission zones, it does not properly capture improvements in operations, as changes in emissions will not reflect any change in operations.

The India-Specific Challenge

In India, there is an increasing need for Scope 3 reporting in line with the SEBI BRSR Core Reporting Principles. The problem here lies in the reliance of large organizations on their vast supply chain systems, which involve small and medium-sized businesses. Most of these SMEs lack the necessary systems for monitoring emissions. Even the process of operations reporting itself is lacking in some of them. This leads to a cascading issue. A large organization requires its Scope 3 reporting, but visibility is lost in lower tiers.

At the same time, pressure from investors, regulators, and global supply chains is increasing. Companies exporting internationally are already seeing stricter ESG reporting expectations from customers and partners.

What Actually Works in Practice

One of the mistakes that most organizations make is that they are trying to measure everything at once, which often results in chaos. Instead, the right thing would be to start from hotspot analysis. Normally, in any company there are certain types that are responsible for emitting most of the carbon. This could be purchased goods, transportation, and use of products.

Other significant steps include transitioning from spend-based estimates to activity-based information. The spend-based approach is very helpful at first because financial information is already in hand. Eventually, however, operational information becomes necessary to determine whether actual improvements in emission reductions have occurred.

Supplier engagement also matters. Many companies send complex questionnaires to hundreds of suppliers at once and receive very little useful information back. A more effective approach is to start with high-impact suppliers first. Build a simple reporting structure. Help suppliers understand what data is needed instead of treating reporting like an audit exercise. This is especially important in India where supplier maturity levels vary significantly.

Why Data Infrastructure Matters More Than Reporting

One area that leadership teams tend to underestimate about Scope 3 is the data challenge. Intent is not usually the problem. Most businesses do have good intentions. The problem is that data resides in isolated environments. There is one system for tracking logistics activities; another for procurement; yet another for vendor information. At the last minute, sustainability teams try to pull it all together. That process does not scale.

The companies making real progress are building internal systems where operational data flows continuously instead of being collected once a year for disclosures. This changes Scope 3 from a compliance exercise into something operationally useful.

Where Most Companies Are Getting Stuck

It is not because the framework itself is unworkable, but because companies are not quite sure about their data. Companies are not sure about which suppliers to focus on first. Companies lack data gathering processes that can be replicated time and again. There is no connection between internal systems. More time is spent on spreadsheet validation than analysis of emissions patterns.

The Bottom Line

Measuring scope 3 emissions is challenging because they occur beyond direct operational control. However, they can no longer be overlooked. Companies that are making progress do not wait until they have the best data. Instead, they create a process that gets better through time by recognizing hot spots and supplier involvement.

The gap between what companies report today and what regulators will soon expect is still manageable. But that gap is closing quickly. And for most businesses, the challenge ahead is not sustainability alone. It is visibility.