Given the forward thinking of the Guardian on environmental issues, we would would be reasonable to suppose that they had put a ban on fossil fuel advertising in place a significant time ago.
However they have now put this ban in place. If bans on fossil fuel advertising are replicated in other parts of the economy this could possibly accelerates the end of fossil fuels anyway.
I suppose as the saying goes better late than never ( it’s alarming to say that about a newspaper that is leading the way but these moves should have occurred a decade ago as the science became clear)