Personal carbon trading (PCT) is a proposed quantity-based policy instrument for reducing the carbon emissions emitted by individuals. The aim of the scheme would be to deliver guaranteed levels of carbon savings in successive years in an equitable way. A PCT scheme would set a total cap on all carbon emissions generated from the fossil fuel energy used by individuals within the home and for personal transport, including those emissions from air travel. In the UK these personal emissions account for approximately half of all carbon emissions. A PCT scheme would be part of an economy-wide emissions trading scheme.