Scope 1, 2 and 3 Emissions, Explained Properly

Every corporate carbon conversation eventually lands on three words: scope 1, scope 2, scope 3. They come from the GHG Protocol — the accounting standard almost every framework builds on — and once you see the logic, they stop being jargon and become a map of where your emissions actually live.

The one-sentence versions

• Scope 1 — you burn it. Direct emissions from sources your organisation owns or controls: fuel in boilers and furnaces, diesel in generators and company vehicles, process emissions, refrigerant leaks.
• Scope 2 — you buy it as energy. Indirect emissions from purchased electricity, steam, heating and cooling. The emissions happen at the power plant, but they exist because of your consumption.
• Scope 3 — everything else in your value chain. Emissions you cause but don't control: purchased goods, freight, business travel, commuting, waste, product use, investments. The GHG Protocol splits this into 15 categories.

Why the split exists

The scopes prevent double-counting inside one inventory while making sure every tonne is someone's responsibility. Your scope 2 is your electricity supplier's scope 1. Your scope 3 upstream is your supplier's scopes 1 and 2. When everyone reports all three scopes, the value chain becomes visible from every angle — and reduction pressure can travel along it.

Concrete examples

Take a mid-size manufacturer with an office and one factory:

• Diesel for the factory's DG set and the delivery van fleet → scope 1
• Natural gas burned in the process furnace → scope 1
• Grid electricity for both sites → scope 2
• Purchased steam from an industrial park utility → scope 2
• Inbound raw materials and outbound road freight on hired trucks → scope 3
• Employee flights, hotel stays, daily commuting → scope 3
• Landfilled factory waste and office paper → scope 3

Why scope 3 dominates — and frustrates

For most companies scope 3 is the largest share of the footprint, and it's also the hardest to measure because the data sits in other organisations' systems. The practical answer is staged: start with the categories you can estimate from your own records (travel booked, freight paid for, waste hauled), use spend- or distance-based estimates where you must, and improve data quality category by category. An imperfect scope 3 number you can explain beats a blank.

Measuring the scopes in practice

The mechanics are the same for every scope: activity data × emission factor = CO₂e. What changes is where the activity data comes from. In the CO2 Dynamics workspace, each category in the factor library carries its scope, so when you log 4,200 litres of diesel or 18,500 kWh of electricity, the tonnes land in the right scope automatically — and the analytics board shows you the split, the trend, and the hotspots.

Start this month

1. List your facilities and the fuels/energy each one uses.
2. Pull one month of bills: electricity, fuel, freight, travel.
3. Log them and read your scope split — it will tell you where to look next.

Related reading: carbon accounting basics and the emission factors behind the numbers.