paying for your private pollution

i just purchased a plane ticket on tuifly.com and was surprised to find (below the rental car, train to the airport, insurance and other useless third-party offers) a section where they had calculated the cost of offsetting the CO2 you will be generating during your flight and offered to send the money to some CO2-sucking up project in Eritrea. At 2 EUR, i figured i could handle that and will feel much better over christmas now.