Scope 1, 2, and 3 Emissions: The Metric Everyone Reports and Almost No One Reports Well

Aug 28

7 min read

Three companies, three completely different emissions profiles, all using the exact same accounting framework. United Airlines' footprint is dominated by Scope 1, the jet fuel its planes burn directly. Nestlé's footprint is roughly 95 percent Scope 3, mostly from dairy and livestock sourced by its suppliers, not anything Nestlé itself burns or plugs in. Deutsche Bank's own operations barely register at all; what actually matters for a bank is Category 15, the emissions financed through its loans and investments. Same three-scope structure, three industries, three almost unrecognizable disclosures.

That's not inconsistency. It's the framework working exactly as designed, which is also exactly why Scope 1, 2, and 3 emissions are simultaneously the most universally reported climate metric in existence and one of the most commonly misread. This article walks through what each scope actually measures, where companies quietly diverge even while technically following the same rules, and how to read a real emissions disclosure without being misled by the ones that are easy to report and the ones that are hard.

What Scope 1, 2, and 3 Actually Measure

All three scopes trace back to one source: the Greenhouse Gas Protocol Corporate Standard, developed jointly by the World Resources Institute and the World Business Council for Sustainable Development, and still the methodological foundation underneath virtually every mandatory climate disclosure regime in the world, including ESRS and IFRS S2.

Scope 1 covers direct emissions from sources a company owns or controls, fuel burned in a company's own vehicles, furnaces, or manufacturing processes. Scope 2 covers indirect emissions from purchased electricity, steam, heat, and cooling, energy a company consumes but doesn't generate on-site. Scope 3 covers everything else: all other indirect emissions that occur up and down a company's value chain, from the goods it buys to what happens after it sells its products.

The boundary logic matters more than it first appears. Scope 1 and 2 are both about what a company directly controls or directly consumes. Scope 3 is about influence without control, emissions a company can shape through supplier choices, product design, or financing decisions, but can't directly command the way it can command its own factory floor.

Key takeaway: the three scopes aren't three versions of the same measurement. They're organized around a company's degree of control, and that distinction is exactly why the three scopes are consistently reported with wildly different levels of confidence.

Scope 2's Quiet Trap: Two Numbers, Not One

Scope 2 looks like the simple one, and it's usually the one companies report with the least explanation, which is a problem, because the GHG Protocol's Scope 2 Guidance actually requires two separate calculations, not one: a location-based figure, using the average emissions intensity of the regional grid a facility draws from, and a market-based figure, using the specific emissions rate of the electricity contracts and renewable energy certificates a company has actually purchased. A company that buys renewable energy certificates can show a market-based Scope 2 figure dramatically lower than its location-based figure, even though the physical electrons flowing into its buildings didn't change at all.

Nestlé's own 2025 disclosure shows exactly how large that gap can get: the company reported Scope 2 emissions of 220,000 tonnes of CO2e using the market-based method, against 2,480,000 tonnes of CO2e using the location-based method, more than a tenfold difference, driven by Nestlé's renewable electricity purchasing rather than any change in what its facilities actually draw from the grid. Neither number is wrong. They're answering two different questions, and a report that only shows one of them, usually the smaller, market-based figure, is giving a reader half the picture.

Key takeaway: whenever a company cites a single Scope 2 number without specifying market-based or location-based, ask which one it is. The gap between the two can be the single largest, and most quietly favorable, choice a company makes in its entire emissions disclosure.

Scope 3: Why the Other Two Scopes Don't Prepare You for It

Scope 3 isn't a bigger version of Scope 1 and 2. It's a structurally different exercise. The GHG Protocol's Corporate Value Chain (Scope 3) Standard organizes it into 15 distinct categories, eight upstream, covering everything feeding into a company's own operations, like purchased goods and services, capital goods, and business travel, and seven downstream, covering what happens after a product leaves the company, like the use of sold products and their eventual disposal.

The standard doesn't treat Scope 3 as optional in any loose sense. Companies are required to screen all 15 categories, calculate the ones that are material, and explicitly document a rationale for any category they exclude, a completeness requirement that a lot of voluntary, early-stage disclosures quietly skip. The standard also ranks calculation methods by data quality, from most to least reliable: supplier-specific data (actual figures from a specific supplier), activity-based data (industry-average emissions factors applied to a company's own purchase volumes), and spend-based data (emissions estimated purely from how much money was spent, the least precise method and, not coincidentally, the easiest one to produce with no supplier engagement at all).

That gap between "screened" and "measured with real data" is where most of the difficulty actually lives. According to CDP, supply chain emissions typically account for somewhere between 70 and 95 percent of a company's total footprint across most sectors, meaning the category with the least reliable default data source is also, for most companies, the one that matters most.

Key takeaway: Scope 3 isn't one number, it's 15 categories with three tiers of data quality behind each one, and a company reporting a single Scope 3 total without saying which categories it covered or which calculation method it used is compressing a lot of real uncertainty into a single, deceptively clean figure.

Three Industries, Three Genuinely Different Emissions Stories

This is where the framework's design becomes concrete rather than abstract. Three real, current disclosures show how differently the same three-scope structure lands depending on what a company actually does.

United Airlines is a clean Scope 1 story. Its 2025 Corporate Impact Report defines its Scope 1 emissions as direct combustion of conventional jet fuel and sustainable aviation fuel by its own aircraft and ground equipment, by far the dominant line in its footprint. Scope 2 is comparatively minor, purchased electricity and steam for its facilities. Scope 3 exists too, covering fuel production emissions upstream of combustion, employee commuting, and investments, but for an airline, the physics of the business puts the center of gravity squarely in Scope 1: you cannot outsource the fuel burn of your own aircraft.

Nestlé is close to the mirror image. As covered above, roughly 95 percent of its footprint sits in Scope 3, and within that, dairy and livestock ingredients alone account for close to a third of the company's total emissions, all of it happening on farms Nestlé doesn't own, several steps upstream of anything the company directly controls. Nestlé's own disclosure states plainly that only about 5 percent of its footprint comes from its own operations at all.

Deutsche Bank represents a third pattern entirely. A bank's own Scope 1 and 2 emissions, office energy use, company vehicles, are close to a rounding error next to what actually matters: Category 15, financed emissions, the greenhouse gases tied to the companies and projects a bank lends to and invests in. Deutsche Bank's own disclosure describes its biggest transition challenge not as its offices but as decarbonizing its lending portfolios, specifically its European residential real estate book and its global corporate loan book. This is a broader pattern across the financial sector: a CFA Institute analysis found that only around a third of financial institutions disclose financed emissions at all, and a Transition Pathway Initiative review of 26 global banks found that none had fully disclosed both their financed and facilitated emissions.

Key takeaway: there's no such thing as a "normal" emissions profile. An airline living in Scope 1, a food company living in Scope 3 agriculture, and a bank living in Scope 3 Category 15 are all correctly applying the same GHG Protocol, and the shape of the disclosure is telling you something real about how each business actually creates its footprint.

Why Almost No One Reports This Metric Well

Put the last three sections together and the pattern behind this article's title becomes clear. Scope 1 is the easiest to report accurately, because it's physically metered: fuel burned is fuel burned. Scope 2 is technically well-defined but frequently reported with only the more flattering of its two required numbers. Scope 3 is where reporting quality falls apart almost universally, not because companies are hiding something, but because the standard itself demands supplier-level data that, for most of the global economy, simply doesn't exist yet in reliable form, which pushes most companies down to spend-based estimates for their largest, least controllable, and most material category.

The financial sector's own numbers make the scale of the gap explicit: a category (Category 15) that most companies treat as a footnote is, for banks and asset managers, the single largest line in their entire footprint, and the honest, sector-wide disclosure rate for it still sits at roughly one in three institutions.

Key takeaway: "reports Scope 1, 2, and 3 emissions" is not a binary yes or no. It spans everything from a fully metered, third-party-verified Scope 1 figure to a spend-based Scope 3 estimate built on almost no primary data, all technically compliant with the same standard.

How to Read a Company's Emissions Disclosure

Check both Scope 2 numbers. If only one is shown, that's a signal worth noticing, and the gap between them tells you how much of a company's Scope 2 improvement comes from actual operational change versus renewable energy purchasing.
Count how many of the 15 Scope 3 categories are actually covered. A company disclosing 13 of 15, the way Nestlé does, is telling you more, and inviting more scrutiny, than one that reports a single Scope 3 total with no category breakdown at all.
Look for the calculation method behind the biggest Scope 3 number. Supplier-specific and activity-based data carry real confidence. A spend-based estimate for a company's largest category is a legitimate starting point, not a finished answer.
Match the scope that matters to the business model. An airline should be judged hardest on Scope 1 progress. A food company or a bank should be judged hardest on its dominant Scope 3 category, not on the comparatively meaningless Scope 1 and 2 figures that happen to be the easiest ones to report cleanly.

References

Greenhouse Gas Protocol, A Corporate Accounting and Reporting Standard, World Resources Institute and World Business Council for Sustainable Development, ghgprotocol.org
Greenhouse Gas Protocol, Scope 2 Guidance, market-based and location-based accounting methods, ghgprotocol.org
Greenhouse Gas Protocol, Corporate Value Chain (Scope 3) Accounting and Reporting Standard, 15 categories, ghgprotocol.org
CDP, disclosure statistics on supply chain (Scope 3) share of total corporate emissions
Partnership for Carbon Accounting Financials (PCAF), The Global GHG Accounting and Reporting Standard for the Financial Industry, Third Edition, December 2025
United Airlines Holdings, Inc., Corporate Impact Report 2025, Environmental Data appendix
Nestlé S.A., Road to Net Zero, nestle.com/sustainability/climate-change
Deutsche Bank AG, Our Carbon Footprint, db.com
CFA Institute, Conundrum Cubed: Scope 3 for Financials, 2024