Carbon Footprint & Scope 1, 2, 3

When a company announces it is “cutting its carbon footprint” or “reaching net zero by 2040,” the headline is easy to repeat and surprisingly easy to misunderstand. Behind those phrases is a shared accounting system — mostly the GHG Protocol, the standard nearly everyone uses to count greenhouse gases. Learn its three “scopes” and a couple of definitions, and the announcements stop being slogans and start being measurable claims you can actually judge.

What a carbon footprint is

A carbon footprint is the total amount of greenhouse gases a company (or product, or person) is responsible for, usually expressed as tonnes of CO2e — “carbon dioxide equivalent.” The “equivalent” part matters: other gases like methane warm the planet more strongly than CO2, so they are converted into the equivalent amount of CO2 to give one comparable number. A footprint is an estimate, not a meter reading, so the method behind it is everything.

To stop companies counting in wildly different ways, the GHG Protocol sorts emissions into three buckets called scopes. The scopes are not about how big the emissions are — they are about who controls the source.

The three scopes, with examples

Scope 1 is direct emissions from sources the company owns or controls. The delivery vans burning diesel, the gas boiler heating the office, the furnace in the factory — if the company is literally doing the burning, it is Scope 1.

Scope 2 is indirect emissions from the energy the company buys. The electricity that powers the lights and laptops was generated somewhere else, often by burning gas or coal. The company did not make those emissions on site, but it caused them by buying the power, so they count as Scope 2.

Scope 3 is everything else across the value chain — all the indirect emissions the company influences but does not control. This includes suppliers making the parts, employees commuting and flying for work, customers using the product, and the eventual disposal of that product. For most companies, Scope 3 is by far the biggest slice, often the great majority of the total footprint.

Why Scope 3 is so hard

Scope 3 is the honest, awkward part. The company does not own the sources, so it has to ask hundreds of suppliers and customers for data many of them do not measure well. Numbers come in as estimates, averages and assumptions. That is why a company can truthfully shrink its Scope 1 and 2 while its Scope 3 stays murky — and why a footprint that quietly ignores Scope 3 may be hiding most of the real impact.

Net zero, carbon neutral and offsets

These phrases sound interchangeable but are not. Carbon neutral usually means a company balances its emissions by buying offsets — paying for activities elsewhere (planting trees, capturing methane) that supposedly cancel out its own pollution. It can be achieved largely through purchases, without the company cutting much itself.

Net zero is a higher bar. It means first cutting your own emissions deeply across all scopes — in line with climate science — and only then using high-quality removals to neutralise the small remainder you genuinely cannot eliminate. The order matters: net zero is “reduce first, offset the residue,” not “keep polluting and pay to look clean.”

Rule of thumb: offsets are the last 5%, not the strategy. A credible net-zero plan shows real cuts to Scope 1, 2 and 3 first, and treats offsets as a top-up, not a substitute.

How to use it

When you hear an emissions claim, ask which scopes it covers — that single question separates serious plans from spin. If a target only mentions Scope 1 and 2, ask about Scope 3, where the bulk usually hides. If a company calls itself “carbon neutral,” ask how much comes from real cuts versus offsets. Useful phrases: “Does that target include Scope 3?” “How much of our footprint is in the value chain?” “Is this reduction or offsetting?” “What’s the quality of those offsets?” Asking them shows you understand that a carbon claim is only as good as the scopes and the cuts behind it.

Spot it: Scope sorting

Read each emission source and decide which scope it belongs to. Tap a card to flip it and check your answer.

Sort the carbon sources

Drag each emission source into the scope bucket where it belongs — Scope 1, Scope 2, or Scope 3. Tap a source, then tap a scope, or drag it there. Hit Check placement when you’re done.