More extreme climate events have happened before a single co2 was emitted by human machines.
You could move goal posts again and claim that we shouldn't expect completely unprecedented extreme events from climate change, just that somewhat extreme events are supposedly becoming more common than before. Even if that was true it doesn't matter because it's not convincing and undeniable.
It's just a fact, not an analysis: sometimes, in the past, there were episodic heat waves.
They aren't related to the ones we're having now (having the same causes, having the same impact, nor having the same scrutinity). But, nonetheless, they happened, and we haven't the same ammount of details to know if they were precedeed by hot years (like we're having right now) or they happened without any anormaly in the previous winter/summer.
This thread is full of people jumping to explain away a highly anomalous weather event as being something other than evidence that points modestly in favor of an overall changing climate.
