Interesting! Swiss / Lufthansa have started a partnership to offset carbon emissions from air travel. To offset the 342 kg of CO2 produced by my forthcoming trip to Ireland will cost CHF 11, for instance. A trip to London is CHF 9. Good stuff - never since the days of indulgences was a clear conscience attainable for less! Too bad that the indulgence cannot be added at the point of sales directly - that is going to be the next step in the sales cooperation, I guess.
Therefore, in the spirit of Sir Charles Napier's immortal pun, let's keep sining!