I am not so sure about 'natural causes' being the cause of the Mini Ice Age. I am open minded to believing that it was Western diseases that killed off 'native' people in the Americas and plagues that killed people in Eurasia resulting in the forest reclaiming man made clearings, sucking CO2 into the plant life and out of the atmosphere and oceans. There was more to it than a dinosaur style die-off with some mega event causing the woe.