The phrase "contentious problem" is grammatically correct and commonly used in written English.
It refers to a situation or issue that is causing disagreement or controversy. Example: "The contentious problem of immigration reform has divided politicians and citizens for decades."
The document addresses the contentious problem of proximity to the spill.
A contentious problem was the hand-over of a detention facility at Bagram, which for the Afghans had become a touchstone of sovereignty and pride — but for the NATO alliance carried risks of letting dedicated enemies back into the fight.
But if the prisoner release controversy was embarrassing, the dramatic public education furore looks set not only to be a more enduring and contentious problem but possibly one that attracts nationwide attention.
YouTuButhas a plan to combat the abundant conspitacy theories that feature in credulous videos on its platform; not a very good plan, but a plan just the same.
Overtime work and wage rates also remain contentious problems.
Barça has provided a distinctive solution to some of the most contentious problems in management theory.
While Congress sat on its hands for most of the last five years, the court took on some of the most contentious problems of presidential power in a set of landmark decisions concerning detainees being held as enemy combatants.
The logistics of the move has been among the more contentious problems, and the notion of relocating detainees in the United States has provoked alarm in some communities and a bipartisan Congressional protest.
The UN climate change talks ended late on Saturday night in Poland with a deal agreed on how to put the 2015 Paris agreement into action, but with other contentious problems left to be resolved next year.
China's resistance to taking a higher international profile on difficult foreign policy issues, and its desire to keep away from contentious problems, is becoming much more challenging.
One might think that the eve of a major bilateral visit would be the time to showcase areas of positive cooperation, and downplay the most contentious problems.
