Anyone with time on their hands might like to trawl through this set of videos on the Younger Dryas comet theory.
See https://cosmictusk.com/9678-2/
https://www.youtube.com/playlist?list=PL28A35f70BD8CA0A8
https://www.youtube.com/watch?v=g2uvhX3D7YI&t=Os&index=8&list-PL28A35F70…