I guess I am a god wizard then because I know me doing my part makes some difference however miniscule and insignificant it is. Something is not nothing, however small.
Of course we cannot stop a climate disaster. But there's grey in between your black and white scenarios. Even if it's a dark dark grey. It doesn't have to be all vantablack. There is no denying whatever laws of physics come into play, it will be worse when we do absolutely fuck all because everything is fucked anyway than if we do our best to make the disaster less bad. Please let's keep the motivation and the hopes up to at least try.
My point is that exactly your attitude in which everything is lost anyway is not helping to prevent the blackest scenario.
Now go outside and get some fresh air while it's still fresh.