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A new study appears to answer contentious questions about the onset and cause of Earth’s Little Ice Age, a period of cooling temperatures that began after the Middle Ages and lasted into the late 19th century. According to the new study, the Little Ice Age began abruptly between A.D. 1275 and 1300, triggered by repeated, explosive volcanism and sustained by a self-perpetuating sea ice-ocean feedback system in the North Atlantic Ocean, according to University of Colorado Boulder Professor Gifford Miller, who led the study. The primary evidence comes from radiocarbon dates from dead vegetation emerging from rapidly melting icecaps on Baffin...

A photo of the Rinjani caldera in Indonesia, while Lavigne won’t name the volcano until his paper is published, insiders suggest this a likely candidate for the missing 1258 AD eruption. Image: Wikipedia From ScienceNews: Indonesia implicated as location of biggest eruption in last seven millennia By Alexandra Witze SELFOSS, Iceland — One of the biggest mysteries in volcanology may finally have a solution. An eruption long thought to have gone off in the year 1258, spreading cooling sulfur particles around the globe, happened the year before in Indonesia, scientists report.Until now, researchers have known a big volcano went off...

When archaeologists discovered thousands of medieval skeletons in a mass burial pit in east London in the 1990s, they assumed they were 14th-century victims of the Black Death or the Great Famine of 1315-17. Now they have been astonished by a more explosive explanation – a cataclysmic volcano that had erupted a century earlier, thousands of miles away in the tropics, and wrought havoc on medieval Britons. Scientific evidence – including radiocarbon dating of the bones and geological data from across the globe – shows for the first time that mass fatalities in the 13th century were caused by one...