Bookmarked Mona Chalabi: what if everyone had an air-mile allowance? – cartoon by Mona Chalabi (theguardian.com)

We could cut global CO2 emissions, and non-travellers could sell theirs to frequent flyers, argues the data journalist

This is brilliant, I’d vote for it in a second:
Mona Chalabi: what if everyone had an air-mile allowance? – cartoon