The Dutch philosopher Marc Davidson posted the following on the closed FB-group Climate ethics research (reproduced here with Marc’s permission):
Who can help with this moral riddle? Somewhere in the near future I have to be in Venice [leaving from Amsterdam]. I can take the train for about 200 Euro, which emits 0.04 ton CO2. Or I can take the plane for about 40 Euro, which emits 0.15 ton CO2 AND spend 160 Euro on buying emissions rights from the EU ETS which will remove 8 ton CO2 emissions. What is better for the climate and what is the moral right thing to do? I really intend to spend the entire difference on compensation.