Great topic @Frederic,
I am also somehow concerned about sustainability. Not a fundamentalist but I think about that (probably because I'm also getting older😁).
I believe many others in and out of Carnity are also. So, following what you mentioned about offseting our footprint, I suggest that Carnity could have an option in its fees for, whoever wants, pay a little extra to offset our drives' carbon footprint. And with all the money gathered, Carnity would invest in a platform to offset, and could inclusively mention that in its marketing material. A little bit like the airline tickets with an extra payment for who wants to offset that flight's carbon footprint.
Just food for thoughts.