Remembering how to write about something other than computer

More on flights

Matthew pointed out that my calculations in the previous post neglect to consider that it's faster flying east than west. I had taken the estimated emissions of flying in economy from Heathrow to JFK, then doubled that number to get the round trip.

The calculator I used seems to give the same number whichever way I ask. I tried a bunch of other calculators, and was a bit surprised by the wide range of answers I got for the return trip:

I think the first two are including other effects beyond pure carbon emissions in a single figure; the Graun estimates them as two separate numbers; ICAO just reports emissions. But I could be wrong!

Anyway, even the most optimistic estimate is a little over 2 years' commuting; if I'm understanding the Guardian's answer right, they think it's more like a decade.

(I picked JFK just for the sake of argument, as somewhere I have flown to several times.)