The Vagueness of Voting

It would seem to me at least extremely unlikely that the emissions from one power station make the difference between climatic catastrophe and not. So then does it follow on your theory that those people shouldn't be bothered about whether or not they act in a way that's environmentally friendly? Well, we should go back to a point that we began with which is the difference between these genuinely vague cases and cases where there is a clear threshold like voting.