6 Comments

Thank you for the succinct summary: a go to site for finding out what is happening in this space.

Your thoughts about a global estimate of GHG emissions from informal transport are interesting. It is just so difficult to quantify this and, in fact, to quantify anything in a way that makes it globally comparable. Most variables in every country will have local measurement problems to deal with. For this particular issue, the estimations will be very sensitive to assumptions about fuel efficiency, journey distances, passenger numbers, congestion etc). Unfortunately, the estimates should have large error bands around them, but we all usually end up speaking in shorthand and use the mean value, which becomes the truth, even if it isn't: a problem in itself if you are trying to track change. I'm sure, though, there a good indirect measures for this, air pollution perhaps and the use of satellite imagery as a comparative metric between places that have been carefully measured and those that haven't.

Regards

Kevin Johnson

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