TheCompensators* use donations and membership fees to buy and delete pollution certificates from the European Emission Trading System (ETS). In this way these pollution certificates are taken out of the ETS and are not available anymore for the European industry. Given the reduced number of certificates the remaining pollution rights increase in price.
A higher price for CO2 means that the emission of climate gases becomes more expensive and climate friendly technologies become more competitive. This is exactly what TheCompensators* want.
So what about you? If you compensate the emissions you produce in your daily life or e.g. of a flight you make a contribution to an effective climate policy and to the reduction of emissions.