I agree with the strong preference for being in person, but I think the realities of the climate situation mean that we should limit as far as possible the amount of air travel for academic meetings and conferences. I travel around Europe by train. Greece is the hard one. US is no longer possible.

Very likely, as long as it is done fully. Statistics always need the Tim Harford question - is that a big number? What would be the expected proportion, relative to total number? I think very likely the actual proportion will be *lower* than the expected, but it will need that context to be clear.

Yes, that's my worry also. I read the original article with great interest, and have bought the book to read properly. I remain concerned, however, that it is over-confident about the ability of democracy, at least as currently constituted, to address the problems.

Is it even sensible to work on the so-called SAF? It is never going to be truly sustainable when you take into account land use and increased flying. Better to concentrate on reduced usage of flying, with concentration on other (e.g. battery) flight for the residual needs.

Interesting article, thanks.