Interesting topic @Frederic
In my line of work, shipping, I see recent and future international legislation to compensate for the fuel used transporting goods. The main question that is still a bit vague is what is done and where these funds end up. From what I can see so far, is that the idea and facilities how to contribute are there, yet the end result of these contributions are unclear to say the least.
I feel that until that question remains unanswered to my satisfaction, for my personal fuel usage I will not be participating in offsetting my carbon footprint by purchasing available credits just yet.
Current alternatives directly usable for petrol/gasoil engines are rather limited and sparse in availability. On top of that there are significant concerns how "used" used cooking oil is and how sustainable large palm (FAME), corn/sugar plantations (ethanol) are, if used for fuel purposes.
At the same time the "green" EV evolution seems to be in line with various government initiatives. However, as long as countries are still very reliant on fossil fuels, read coal, to produce the electricity that is required for these, I feel that if looking at source to final usage, petrol is probably not the worst pollutant overall. Taking in account the effect of mining coals and or materials for batteries the environmental impact seems worse. Recycling of special minerals at this point are also quite labor and energy reliant, so the effects on those should not be underestimated.
There are ofc various initiatives in the world producing electricity on a more sustainable way: solar panels, wind or water turbines, but also these all come with some (negative) impact on local fauna or flora, disregarding the resources required for manufacturing.
In short, I think the main area where the required resources should be assigned is R&D. Not for quick fixes or moving the source of pollution to another area or further up the production chain.
What that means for me personally; keep myself informed on latest developments and ensure I implement improvements over which I have immediate control: change lightbulbs, more efficient heating/cooling, put in energy measuring points, turn off appliances when not in use, absolute no littering, recycle as much is possible and try to plant another tree!!