Carbon credits are used to deliver your carbon offset. A carbon credit represents one tonne of carbon (or equivalent greenhouse gas) emissions reduced.
Carbon credits are issued to projects in New Zealand and overseas which can demonstrate that they have been verified to reduce or remove carbon emissions. For example, if a project has been verified to reduce emissions by 10 tonnes, then it is eligible to receive 10 carbon credits.
When you offset your carbon, you purchase and retire the equivalent amount of carbon credits, supporting projects which reduce or remove carbon emissions.
When the carbon credit is retired (or 'cancelled' in some registries) it is removed from circulation in that registry and cannot be used again by another buyer.