An increasingly popular way for individuals or companies to demonstrate their sustainability is carbon offsetting. Avoiding emissions as far as possible is of course the most meaningful form of climate protection but it is unfortunately not always possible to avoid all emissions. Carbon offsetting can help in this area: The system is based on the Clean Development Mechanism (CDM) that was introduced as part of the Kyoto Protocol. CO2 emissions are offset as part of the CDM through investment in certified climate protection projects. The RAL Quality Mark for CO2 Compensated Energy Products is based on a reliable calculation method for the purchase of CO2 reduction certificates that is tested by independent organisations. It ensures that only reliable emission certificates can be used to offset greenhouse gas emissions. In addition, it includes detailed rules for how companies certified with the RAL Quality Mark convert their emissions into certificates.