AFOLU / FLAG — Definition and GHG Accounting Context
Roughly a fifth of all human greenhouse gas emissions come from neither smokestacks nor tailpipes, but from the land — cattle, rice paddies, fertilised soils, and the clearing of forests. This is the one sector that also runs in reverse: growing forests and building soil carbon pull CO₂ back out of the air. Accounting for a source that can be negative, and whose “fuel” is living carbon, needs its own rulebook.
Two frameworks provide it. AFOLU is the land sector of the IPCC national inventory; FLAG is the SBTi’s matching category for corporate science-based targets. Both account the same land-based emissions and removals — one for countries, one for companies.
AFOLU (Agriculture, Forestry and Other Land Use) is the IPCC national-inventory sector covering land-based emissions — enteric methane, manure, rice, fertiliser N₂O — and the CO₂ flux of land-use change and forestry. FLAG (Forest, Land and Agriculture) is the SBTi category requiring land-intensive companies to set separate targets for those same emissions plus CO₂ removals. AFOLU is territorial; FLAG is a company value-chain target.
Definition — The Land Sector, Two Frames
AFOLU — Agriculture, Forestry and Other Land Use — is the sector of the IPCC greenhouse-gas inventory guidelines that gathers all land-based emissions and removals into one place. Introduced in the IPCC 2006 Guidelines, it merged two previously separate sectors: “Agriculture” (livestock and soils) and “LULUCF” (Land Use, Land-Use Change and Forestry). It is the framework countries use to report the land component of their national inventories.
FLAG — Forest, Land and Agriculture — is the corporate counterpart, published by the Science Based Targets initiative in 2022. It is the first framework that lets companies set science-based targets for their land-based emissions. Companies in land-intensive sectors — food, agriculture, forestry, paper — must set a FLAG target that sits alongside, and separate from, their ordinary energy-and-industry target.
The two are best understood as the same physical reality seen through different lenses. The methane from a herd of cattle, the CO₂ from clearing a forest, the carbon drawn down by a growing plantation — these are the same emissions and removals whether a country logs them in its AFOLU inventory or a company counts them toward its FLAG target. What differs is the boundary (a territory versus a corporate value chain) and the purpose (reporting versus target-setting). Neither reproduces the other’s rules; this page defines each and points to the standards and calculators that own the detail.
Definition at a glance
| AFOLU stands for | Agriculture, Forestry and Other Land Use |
|---|---|
| FLAG stands for | Forest, Land and Agriculture |
| What they cover | Land-based emissions and removals: livestock, soils, rice, land-use change, forestry |
| AFOLU owner | IPCC — a national-inventory sector (territorial) |
| FLAG owner | SBTi — a corporate target category (value chain) |
| Share of global emissions | ~22% of net anthropogenic GHG (IPCC AR6) |
What Counts: The Two Emission Families
Whichever frame you use, land-sector emissions fall into two families with very different chemistry. The first is agricultural non-CO₂ — biological releases of methane and nitrous oxide. The second is the CO₂ flux of the land itself, which is the only family that can run negative.
| Family | Sources | Gas | Direction |
|---|---|---|---|
| Agricultural non-CO₂ | Enteric fermentation (livestock digestion), manure management, rice cultivation, fertiliser & managed soils, field burning | CH₄, N₂O | Emission only |
| Land CO₂ flux | Deforestation & land conversion (emit); afforestation, forest regrowth, soil-carbon building (remove) | CO₂ (biogenic) | Emission or removal |
The non-CO₂ family is why the land sector matters so much despite emitting relatively little CO₂ directly: methane and nitrous oxide are far more potent per tonne than carbon dioxide, so a herd of cattle or a fertilised field carries a large CO₂-equivalent footprint. The land-CO₂ family is what makes the sector unique — it is the one place in a greenhouse-gas inventory where genuine removals appear.
AFOLU vs FLAG — Inventory Sector vs Corporate Target
Because they cover the same physical emissions, AFOLU and FLAG are constantly conflated. They are not interchangeable: one is a national reporting sector, the other a corporate target framework, and mixing them up leads to boundary errors. The distinction:
| AFOLU | FLAG | |
|---|---|---|
| Full name | Agriculture, Forestry and Other Land Use | Forest, Land and Agriculture |
| Owner & origin | IPCC — 2006 Guidelines | SBTi — 2022 guidance |
| Purpose | National GHG inventory sector | Corporate science-based targets |
| Boundary | Territorial (a country’s land) | Company value chain (Scope 1 + 3) |
| Removals | Land sinks reported in the inventory | A separate CO₂-removal target, not netted against gross |
| Deforestation | Logged as land-use-change emissions | Explicit no-deforestation commitment required |
The corporate accounting that connects the two — how a company actually inventories its land emissions and removals to feed a FLAG target — is set out in the GHG Protocol Land Sector and Removals Guidance. It is the bridge between the IPCC’s territorial science and the SBTi’s corporate targets.
Why the Land Sector Is Different
Three features set land-sector accounting apart from every other part of an inventory, and each one shapes how AFOLU and FLAG treat the numbers.
The land sector is the only major source that also removes CO₂: growing forests, restored peatlands, and soil-carbon programmes are genuine sinks. Both AFOLU and FLAG count them — but as a separate line, not by quietly subtracting them from gross emissions. Reporting gross emissions and removals separately keeps a company from hiding a rising emissions figure behind a growing forest, and it is why FLAG sets a distinct removal target rather than a single net number.
The second feature is biogenic carbon: the CO₂ moving through the land sector was recently drawn from the atmosphere by photosynthesis, so it is tracked differently from fossil CO₂ and can only be called a durable removal when it is stored for the long term. The third is uncertainty — biological and soil fluxes are harder to measure than a metered fuel, so the IPCC provides tiered methods (from default Tier 1 factors up to measured Tier 3) to match effort to data availability.
Counting Land Emissions: A Worked Example
The most common AFOLU source is enteric fermentation — the methane cattle and other ruminants produce as they digest. IPCC Tier 1 gives a default emission factor per animal per year. Crucially, these factors are stated as raw kilograms of methane, not CO₂-equivalent — you convert to CO₂e by multiplying by the biogenic-methane GWP. The live IPCC 2019 Tier 1 factors:
Enteric methane, kg CH₄ per head per year (IPCC 2019 Tier 1, global default, live). Ruminants (cattle, sheep) dwarf monogastrics (pigs, poultry) because their four-chambered digestion ferments fibre. These are methane masses — multiply by the GWP to reach CO₂e.
A dairy farm runs a 100-cow herd. Using the live Tier 1 factor above and the AR6 biogenic-methane GWP of 27 (snapshot 2026-07-26):
- Methane: 100 cows × 138 kg CH₄ = 13,800 kg CH₄ / year.
- CO₂-equivalent: 13,800 × 27 = 372,600 kg CO₂e ≈ 372.6 t CO₂e / year — from enteric fermentation alone, before manure, feed, or land-use change.
The AFOLU Enteric Fermentation Calculator runs this for any herd and Tier, and the wider FLAG Emissions Calculator rolls enteric, manure, land-use change, and removals into a corporate FLAG boundary. Nitrous oxide from fertiliser adds another large slice: synthetic nitrogen carries roughly 5.765 kg CO₂e per kg of nitrogen applied.
FLAG in Practice: What SBTi Requires
FLAG turns land-sector science into a corporate obligation. A company must set a FLAG target — separate from its energy-and-industry science-based target — if it operates in a designated land-intensive sector, or if land-related activities make up 20% or more of its total emissions. What a FLAG target covers:
- Land-management emissions — the agricultural non-CO₂ (enteric, manure, rice, fertiliser) plus soil-carbon change on land the company controls or sources from.
- Land-use-change emissions — the CO₂ from converting forest or other native ecosystems in the supply chain, paired with a commitment to eliminate deforestation.
- CO₂ removals — sequestration from restoration, agroforestry, and improved land management, counted toward the target as a distinct removal figure.
FLAG targets feed a company’s overall net-zero commitment under the SBTi Corporate Net-Zero Standard, but they are ring-fenced: a food company cannot use a fossil-fuel reduction to hit its land target, or vice versa. The separation is deliberate, because the two sets of emissions decarbonise on very different timescales and levers.
Common Confusions
- Treating AFOLU and FLAG as the same thing. AFOLU is an IPCC national-inventory sector; FLAG is an SBTi corporate-target category. They cover the same physical emissions at different scales and for different purposes.
- Thinking AFOLU is only agriculture. It also covers forestry and all other land use — including the CO₂ removals from growing forests and building soil carbon, not just livestock and crops.
- Netting removals into gross emissions. Land sinks are real but must be reported separately from gross emissions, never quietly subtracted — the core discipline of both AFOLU and FLAG.
- Reading enteric factors as CO₂e. IPCC Tier 1 enteric factors are raw kilograms of methane (dairy cattle: 138 kg CH₄/head/yr). Multiply by the biogenic-methane GWP (27) to get CO₂e.
- Confusing land-management with land-use-change. FLAG separates the ongoing emissions of managing land (fertiliser, livestock) from the one-off pulse of converting it (deforestation). Both are in scope, but tracked apart.
Frequently Asked Questions
They cover the same land-based emissions and removals but serve different purposes. AFOLU (Agriculture, Forestry and Other Land Use) is a sector of the IPCC national greenhouse-gas inventory guidelines — the framework countries use to report the land component of their territorial emissions. FLAG (Forest, Land and Agriculture) is the SBTi‘s corporate target category — the framework companies use to set science-based targets on their land-related emissions across their value chain. AFOLU is an inventory sector; FLAG is a target framework. The GHG Protocol Land Sector and Removals Guidance provides the corporate accounting rules that connect them.
AFOLU includes two families of emissions plus removals. The first is agricultural non-CO₂: methane from enteric fermentation (livestock digestion), methane and nitrous oxide from manure, methane from rice cultivation, and nitrous oxide from fertiliser and managed soils. The second is the CO₂ flux of the land itself — emissions from deforestation and land conversion, and removals from afforestation, forest regrowth, and soil-carbon building. AFOLU was introduced in the IPCC 2006 Guidelines by merging the previously separate “Agriculture” and “LULUCF” (Land Use, Land-Use Change and Forestry) sectors. Together it accounts for roughly 22% of net global greenhouse-gas emissions.
Under SBTi rules, a company must set a FLAG (Forest, Land and Agriculture) target if it operates in a designated land-intensive sector — such as food production, agricultural commodities, forestry, and paper — or if land-related activities account for 20% or more of its total emissions. The FLAG target is separate from the company’s ordinary energy-and-industry science-based target and covers land-management emissions, land-use-change emissions, and CO₂ removals, alongside a commitment to eliminate deforestation. Both targets feed the company’s overall net-zero commitment under the SBTi Corporate Net-Zero Standard, but they cannot be traded off against each other.
Because netting them together hides information. The land sector is unique in producing large CO₂ removals — growing forests, restored peatlands, soil-carbon programmes — but if a company simply subtracted those removals from its gross emissions, a rising emissions figure could be masked behind a growing sink. Both AFOLU and FLAG therefore require gross emissions and removals to be reported as separate lines. This is also why FLAG sets a distinct removal target rather than a single net number, and why the removed carbon must be genuinely durable — the biogenic CO₂ stored in a forest only counts as a removal for as long as it stays stored.
Using the IPCC 2019 Tier 1 global default, a dairy cow produces about 138 kg of methane per year through enteric fermentation, and a beef animal about 64 kg — far more than a sheep (8 kg) or a pig (1.5 kg), because ruminants ferment fibre in a four-chambered stomach. These factors are stated as raw kilograms of methane, not CO₂-equivalent, so you convert by multiplying by the biogenic-methane GWP of 27 under IPCC AR6. A dairy cow’s 138 kg therefore equals about 3.7 tonnes CO₂e per year. The enteric fermentation calculator handles the conversion and higher-Tier methods.