Solar activity / instability at present is the highest it has been since the end of the last ice age,* says geologist Robert Schoch, Ph.D., in this startling video from thunderbolts.info
A major solar outburst could end an ice age, incinerate the surface of the Earth (leaving only large stone structures remaining). create deluges of Biblical proportions as plasma would evaporate water and ice which would later be re-precipitate, and the cataclysm would force survivors to seek shelter in thick stone buildings, caves, and underground, says Schoch.
http://iceagenow.info/2012/06/catastrophic-termination-ice-age-video/