The Little Ice Age occurred between approximately 1250-1850 AD. It was a period of global cooling, with temperatures 2-3 degrees Celsius lower than preceding centuries. There is some debate around when it began, with some citing increased Atlantic ice in 1250 and others the first climatic minimum in 1650. It consisted of three distinct cold periods and was likely influenced by decreased sunspot activity and increased volcanic eruptions emitting sulfur. The Little Ice Age had significant effects on agriculture and society, including failed harvests, famine, population declines, and socio-political instability.