During it, he commented "while I was on the plane from San Francisco to Japan I hacked on
This seemed rather an unfair question to ask in public, but when I told it to him later in the pub* he laughed. However the full question is slightly longer:
What is the carbon cost of the modules' creation? What is the carbon saving from reduced dev time and reduced server load from using the modules? When is the cross over point?
And, I guess, a more general abstract question - is jetting off to all these conferences we like to go to cost effective? Do we save more from what we learn than we pay to get there?