The aberrant global synchrony of present-day warming

The aberrant global synchrony of present-day warming
Nature 571, 483-484 (2019)
Were extended warm or cold periods in the past worldwide, or only regional? Efforts to reconstruct Earth’s climate history suggest that the near-global extent of ongoing warming is unparalleled over the past 2,000 years.
The familiar maxim that the climate is always changing is certainly true. But even when we push our perspective back to the earliest days of the Roman Empire, we cannot discern any event that is remotely equivalent — either in degree or extent — to the warming over the past few decades. Today’s climate stands apart in its torrid global synchrony.