Those are valid points to make, but they don't relate to the figure. The chart should just show the raw naked numbers, and then we can layer our understanding o

Those are valid points to make, but they don't relate to the figure. The chart should just show the raw naked numbers, and then we can layer our understanding on top of it. Something like, "so the chart says air travel is x times more efficient, but given how bad it is for the environment I think..." If the chart is already a mish mash of numbers with someone's subjective opinions of the sort you mention then it's useless.