The phrase "a plethora of causes" is correct and usable in written English.
It can be used when discussing a wide variety of reasons or factors contributing to a particular situation or outcome.
Example: "The study identified a plethora of causes for the decline in bee populations, ranging from pesticide use to habitat loss."
Alternatives: "an abundance of causes" or "a multitude of causes".
Mr. Sánchez has embraced a plethora of causes ranging from genetically modified crops to the Sahrawi people's struggle for self-determination in Western Sahara.
He has rallied the residents around a plethora of causes, from resisting genetically modified crops to supporting the Sahrawi people's struggle for self-determination in Western Sahara.
THE United Nation's summit on sustainable development, now under way in Johannesburg, is a rallying point for a plethora of causes, some more deserving than others.
As a leaderless movement embracing a plethora of causes, Occupy needed to design an identity, which would be distinctive and memorable, yet versatile enough to reflect its geographic and political diversity.
He has been involved in a plethora of causes and campaigns for a number of organizations in a variety of venues.
Epilepsy can rise from a plethora of causes.
Far from carefully choosing a few business-friendly good causes, Lush has backed a plethora of controversial causes from Guantanamo prisoners, to hunt saboteurs and the anti-fracking campaign.
One respondent described "resource allocation is a political decision"; where a limited supply of resources and a plethora of demands cause "political pressures and elitism (to) influence(s) decisions at every level, in every department".
We embrace a plethora of movements and causes.
In recent years, the progress in sequencing technology has supported the identification of a plethora of novel disease-causing genes in multiple families with ANCL-like clinical features and GROD-type storage material.
The bacterium can cause a plethora of infections in dogs and is also capable of causing infections in humans [ 2].
