Comment by richardknop

This has been happening throughout history of Earth. Just look at all the ice ages (including the most recent so called little ice age).

Just cca 11,000 years ago, without any human intervention (nobody driving SUVs around back then), temperature has risen dramatically which caused massive ice sheets on top of North America and Europe to melt. This caused sea levels to rise by 120 meters, swallowing an area of land larger than China and Europe combined.

Until this day we still don't know what caused that (and it seems to be a reoccurring event as it has happened multiple times). The last time it happened it has caused extinction of most of megafauna (with some remnants surviving in Africa as it was least affected).

We are struggling to cope with sea levels rising by 1-2mm per year. Imagine if they rose by 120m in couple of years. All coastal mega cities - NYC, SF, Tokyo etc would be underwater completely.