I found this to really illustrative of what 1.5 might mean. https://xkcd.com/1732/ https://xkcd.com/1732/ And it's not speculative - it's historical. It shows

I found this to really illustrative of what 1.5 might mean. https://xkcd.com/1732/ https://xkcd.com/1732/ And it's not speculative - it's historical. It shows that decline of 4.5 means basically complete icing of the north North America and puts 1.5 in perspective.