Dave Reay, the director of the Edinburgh Climate Change Institute, said world leaders "must have the findings of this report seared into their minds" at the November conference and take urgent action.
"This is not just another scientific report," Reay said. "This is hell and highwater writ large."
Does "writ large" refer to "hell and highwater" in "This is hell and highwater writ large."?
Is it a metaphor that could be paraphrased: This is much more worse than even we can imagine?
LITERARY 1clear to almost anyone Surprise was writ large on her face.
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https://www.macmillandictionary.com/dictionary/american/writ_2
Surprise was writ large on her face.