Environmental changes have had far greater impact than kings and battles
istorians often rely on new discoveries in order to make breakthroughs. Every now and again, a fresh document, a set of papers or a whole manuscript is found by chance. Maybe something unexpected and surprising will pop up from an archaeological dig or – in the case of inns and oasis towns along the Silk Roads – from the declassification ofsatellite images taken during the cold war, which revealed sites that had long fallen out of use and been forgotten on the ground.
That’s the case because so many of these new sources are linked to “climate archives” – data that can be collected from the analysis of tree rings, by measuring calcium carbonate deposits in caves or by assessing carbon dioxide bubbles and impurities in ice cores drilled in Greenland, the Antarctic and elsewhere.
Evidence within tree rings and ice cores serves as a reminder of existential questions we must now so urgently address Global weather systems such as the El Niño-Southern Oscillation, a cycle of warm and cold periods in the Pacific Ocean, have had huge and unpredictable consequences for human civilisation.
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