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Discover LudwigThe phrase "a single cause" is correct and usable in written English.
It can be used when discussing a specific reason or factor that leads to a particular outcome or effect.
Example: "In this study, we aim to identify a single cause for the increase in pollution levels in the city."
Alternatives: "one reason" or "a sole factor".
Exact(59)
Failure rarely has a single cause.
Is it even possible to locate a single "cause"?
Not entirely; nothing in the climate has a single cause.
There may not be a single cause behind that decline.
The changes in the Antarctic landscape do not have a single cause.
"There may not have been a single cause of Neanderthal extinction," said Stringer.
It is unlikely there was a single cause for Mr. Cobain's suicide.
Neither is there the evidence to suggest a single cause behind these trends.
She owes most of her uniqueness to a single cause: her longevity on the throne.
And so, from a single cause, a local activist was born.
The first lesson of fundraising is limit yourself to a single cause.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com