I suspect the 1% are mostly people travelling for business not purely leisure. If you consider the amount of auto emissions say a truck driver in the US emits c

I suspect the 1% are mostly people travelling for business not purely leisure. If you consider the amount of auto emissions say a truck driver in the US emits compared to most of the world where even access to auto mobiles is expensive, I wouldn't be that surprised personally. That's that's why I included, "(or some equally small fraction of the population)". We should expect a small percentage in any sample like this to be extreme outliers. We call them "power users" in tech, but the same applies to most activities.