An Ass Becomes a Canary

What do you say when the head of Shell Oil Company starts worrying out loud about global warming? We heard about this a couple of days ago and found the story this a.m. Is it any kind of progress that the CEO of a major fossil-fuel conglomerate starts to agree in public that maybe we've signed our own death warrant by burning too much of his particular product? Not that he's about to stop selling that product! Only that he acknowledges the irony.