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>> “What caused our last Ice age?” <<
The only ice age we have ever had was caused by the increased precipitation from the hot oceans that remained after the Genesis judgement. (a giant global El Ni~o)
Sunspot formation is triggered by a magnetic field, which scientists say is steadily declining. They predict that by 2020 there may be no remaining sunspots, and the sun may stay spotless for several decades.
The last time the sunspots disappeared altogether was in the 17th and 18th century, and coincided with a lengthy cool period on the planet known as the Little Ice Age....and lasted 400 years.
Good luck surviving with no coal powered electricity