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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

Emissions

Direct emissions from owned sources.

Fuels burned in company vehicles, boilers, furnaces, and fugitive refrigerant leaks.

Scope 2

Emissions

Indirect emissions from purchased energy.

Electricity, steam, heating and cooling bought from utilities. Reported as location- and market-based.

Scope 3

Emissions

Value-chain emissions, up- and downstream.

Purchased goods, business travel, employee commuting, use of sold products, end-of-life. Often >70% of footprint.

Additionality

Markets

Reductions 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

Markets

Emissions shifted, not avoided.

When a project displaces emissions to another location or sector instead of eliminating them.

Permanence

Nature

How 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

Standards

Measurement, Reporting, Verification.

The end-to-end process for quantifying climate outcomes and having them independently checked.

SBTi

Targets

Science Based Targets initiative.

Validates corporate emission reduction targets aligned with the Paris Agreement (1.5°C pathway).

LCA

Methods

Lifecycle Assessment.

Cradle-to-grave evaluation of environmental impacts across raw materials, manufacturing, use and disposal.

Offsetting

Markets

Compensating residual emissions.

Buying verified credits for reductions or removals elsewhere — best used after deep internal reductions.

Net Zero

Targets

Balanced sources and sinks.

Cutting emissions by ~90% and neutralising the rest with high-quality removals — not the same as 'carbon neutral'.

tCO₂e

Units

Tonnes of CO₂ equivalent.

Standard unit normalising different greenhouse gases by their global warming potential (GWP).

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