[_Microft]

The problem with ICEs is not that they emit carbon dioxide but that the fuel they use is from fossil sources. This adds additional carbon into the carbon cycle which was 'locked away' for millions of years but is now re-introduced into the shorter term carbon cycle with all the effects that has.

So theoretically one could have carbon neutral ICEs by not using fossil fuels, which could be sourced by converting carbon dioxide into fuel:

https://en.wikipedia.org/wiki/Fischer%E2%80%93Tropsch_proces...

I don't think that this is a reasonable thing to do though. Go electric instead. Producing and transmitting electricity is easier and also more flexible as different sources (solar, wind, hydro, nuclear...) can be used.