It's more like a death row inmate worrying about another cigarette.

Anyway, like I said my current life is fairly low impact. Remote work helps a lot. But it doesn't make any difference, especially inasmuch as me not buying fossil fuels made infinitesimally cheaper for someone else to. It will stay that way until we price emissions appropriately.

Converting a few acres of sheep grazing land to forest could make this chunk of my lifs carbon negative, for that matter. Lamb is especially bad.

This is like someone saying that, since other people litter, there's no harm in me littering too. Sure, your individual action doesn't matter but collective action does.

Similarly, by your logic, why should I vote? After all, it is extremely improbable that my vote will have any impact on an election.