Facts4COP21: Adaptation financing according to consumption-based emissions: taxing air tickets a close proxy.
According to a recent study by French economists Chancel and Piketti (author of Capital in the 21st century) taxing air tickets to raise adaptation finance would be easy to implement but may not hit the highest emitters most effectively. Other options might do a better job of this, like focussing on consumption-based emissions and taking contributions from countries whose individuals emit above world average. In these options, those that are most able to afford it and those that contribute most to current and future climate impacts would pay for adaptation. However, these options may be administratively difficult to implement. See more results of the study here.