Nobody is sure. Leading ideas are orbital cycles, decreased solar activity, increased volcanic activity, changes in ocean currents, re- or de-forestation as a

Nobody is sure. Leading ideas are orbital cycles, decreased solar activity, increased volcanic activity, changes in ocean currents, re- or de-forestation as a result of declines in human population, and just the fact that climate is complex and variable. https://en.wikipedia.org/wiki/Little_Ice_Age#Possible_causes https://en.wikipedia.org/wiki/Little_Ice_Age#Possible_causes