Originally Posted by Xandrios

So the KG of CO2 is based on the route and class of service. The price of the underlying ticket does not really matter it looks like. This also means that, in order to make this most efficient, you will need to find a flight that in distance results in a fee closest to the 10/19/33/469 euro figure. Not expecting them to do fractions/rounding...

Playing around with some routes these are actually quite high thresholds. Long European flights don't really qualify at all, not reaching the minimum amounts quoted.
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You will need a ticket to be able to buy the compensation, right? Question is, what happens if you don't fly that ticket - will they also refund the compensation (and potentially remove the XP from your account if those are credited at purchase)?