If the N’s were killed off by climate change, why weren’t the CroMagnons killed off as wel? Since they apparently lived in close proximity and mated. That is evidenced by the studies that have shown that there are N genes in certain segments of Earth’s present population.
The cromags drove pwee-uthses and used solar panels while the b’s stuck to their suvs and fossil fuels.
It seriously does not make a lot of sense.