Peter Sinclair has a new video of the possible collapse of the West Antarctic Ice Sheet, or – more correctly I think – the early stages of a marine ice sheet instability. I include the video below and it’s well worth watching. If you want to know more, I also recommend Bethan Davies’s post.
I’m very obviously not an expert on ice sheet instabilities, but this whole topic has lead to the standard claims of alarmism : “It’s going to take centuries, why is everyone claiming it’s collapsing? It’s alarmist!” The fundamental issue here – as I understand it – is that we may have crossed the point where it is possible to stop this from happening. The process may initiate a positive feedback loop that is irreversible. It’s quite possible – given the timescale – that we can easily cope with the subsequent rise in sea level. That’s not really the point, though : we’ve potentially influenced our climate in a way that is irreversible. I also don’t think that we should gloss over the significance of the possibility that we’ve crossed a tipping point.
Anyway, I suggest watching the video and deciding for yourselves.