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Carbon Glossary
Plain-language definitions of the terms you will meet across every climate programme Hover any card for the deeper read
Scope 1
EmissionsDirect emissions from owned sources.
Fuels burned in company vehicles, boilers, furnaces, and fugitive refrigerant leaks.
Scope 2
EmissionsIndirect emissions from purchased energy.
Electricity, steam, heating and cooling bought from utilities. Reported as location- and market-based.
Scope 3
EmissionsValue-chain emissions, up- and downstream.
Purchased goods, business travel, employee commuting, use of sold products, end-of-life. Often >70% of footprint.
Additionality
MarketsReductions wouldn't have happened anyway.
A project is additional if the carbon revenue is what enabled it — without crediting, the activity would not occur.
Leakage
MarketsEmissions shifted, not avoided.
When a project displaces emissions to another location or sector instead of eliminating them.
Permanence
NatureHow long the carbon stays stored.
Concerns whether stored carbon (e.g. in forests) might be re-released by fire, pests, or land-use change.
MRV
StandardsMeasurement, Reporting, Verification.
The end-to-end process for quantifying climate outcomes and having them independently checked.
SBTi
TargetsScience Based Targets initiative.
Validates corporate emission reduction targets aligned with the Paris Agreement (1.5°C pathway).
LCA
MethodsLifecycle Assessment.
Cradle-to-grave evaluation of environmental impacts across raw materials, manufacturing, use and disposal.
Offsetting
MarketsCompensating residual emissions.
Buying verified credits for reductions or removals elsewhere — best used after deep internal reductions.
Net Zero
TargetsBalanced sources and sinks.
Cutting emissions by ~90% and neutralising the rest with high-quality removals — not the same as 'carbon neutral'.
tCO₂e
UnitsTonnes of CO₂ equivalent.
Standard unit normalising different greenhouse gases by their global warming potential (GWP).