Through the carbon offsetting scheme, passengers can purchase carbon credits generated by certified environmental and social projects in developing countries that are verified to offset greenhouse gas emissions.
A carbon credit is a permit that represents one tonne of carbon dioxide (CO2) that has either been removed from the atmosphere or prevented from being emitted. These carbon credits are then "retired" on an official register to ensure that they cannot be sold or used again. Carbon credits create a market for offsetting greenhouse gas emissions by giving a monetary value to the cost of polluting the air.
There are two principal types of carbon credits: certified emission reductions (CERs) and voluntary emission reductions (VERs). CERs are backed by the United Nations. VERs are backed by recognised quality standards, such as the Voluntary Carbon Standard (VCS) and the Gold Standard. VERs play an important role in emission projects with high sustainable development benefits.