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The phrase "a key cause of" is correct and usable in written English.
It can be used to identify a significant factor contributing to a particular outcome or situation.
Example: "The researchers found that a key cause of the decline in bee populations is the widespread use of pesticides."
Alternatives: "a major factor in" or "a primary reason for".
Exact(59)
In many studies, debt has been shown to be a key cause of mental illness.
A key cause of this increase was stagnant real incomes, so credit was used to keep living standards constant.
Clearly, indifference by state policy makers has been a key cause of the Medicaid abuses in New York.
Linked to this is unemployment; a key cause of isolation is not having a job to go to.
The EU's "open border" policy, which allowed unrestricted internal migration, was a key cause of concern among voters.
The rise in unit labour costs (see chart) has been a key cause of Italy's chronic lack of growth.
Federal revenues are at a historically low level and are a key cause of the federal budget deficit.
"There is overwhelming evidence that inequality is a key cause of stress, and also exacerbates the stress of coping with material deprivation," the report says.
The two groups referred to date labels as "a key cause of the high and rising rates of waste in the United States".
Tellingly, the administration's executive summary of its proposals highlights "compensation practices" as a key cause of the crisis, but then fails to say anything about addressing those practices.
Sugar has nonetheless been identified as a key cause of obesity and associated diseases later in life such as heart problems, cancer and type two diabetes.
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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