I know what you mean about this. He simply refuses to take any of it seriously and continuously grasps at minutia of one sort or another as evidence that that we ought not try and do anything about global climate change.

I will tell you what I do know though - he is an academic who has a background in mining. I should note that he oftentimes writes about coal mining with a considerable amount of detailed information.

With respect to the arctic ice melt, I think it is easy to think that we are already past a tipping point, and it is too late to do anything.

If there is any possibility that the current arctic ice problems are temporary, I think it is helpful to hear the evidence. Otherwise, it is easy to come to the conclusion of "why bother, its hopeless" when looking at the climate change situation today. If it looks like there is a possibility of hope on the arctic ice melt, I think it gives a stronger argument for taking action with respect to our longer term warming problems.

It may or may not be too late for the Arctic, but the Antarctic is another matter entirely. With some deniers, delay until inevitable seems to be the desired outcome.

There is more to the climate than sea level, of course. Even if all of the ice does melt, the average temperatures will still depend on the levels of CO2 in the atmosphere.

I guess I look at it this way. We are going to have to get off of fossil fuels sooner or later anyways. Yes, we could put it off as long as possible, and thereby ensure inevitability, or we can act sooner and perhaps leave behind a more comfortable planet for us to live on.

There is considerable archaeological evidence that the Thule migrated. It is also worth noting that the Antarctic ice cap is currently larger than previously recorded.