No evidence for globally coherent warm and cold periods over the preindustrial Common Era

@article{Neukom2019NoEF,
  title={No evidence for globally coherent warm and cold periods over the preindustrial Common Era},
  author={Raphael Neukom and Nathan J. Steiger and Juan Jos{\'e} G{\'o}mez-Navarro and Jianghao Wang and Johannes P. Werner},
  journal={Nature},
  year={2019},
  volume={571},
  pages={550-554}
}
Earth’s climate history is often understood by breaking it down into constituent climatic epochs1. Over the Common Era (the past 2,000 years) these epochs, such as the Little Ice Age2–4, have been characterized as having occurred at the same time across extensive spatial scales5. Although the rapid global warming seen in observations over the past 150 years does show nearly global coherence6, the spatiotemporal coherence of climate epochs earlier in the Common Era has yet to be robustly tested… 
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