The correct sentence should be: "Health experts worldwide are concerned about the surge in health problems."
The error is in the use of "are concerning," which should be "are concerned" to correctly express the passive sense of being worried.
The phrase "are concerning" is active and suggests that health experts themselves are causing concern, which is incorrect.
Using "are concerned" correctly indicates that the experts feel worry or anxiety about the issue.
This change improves clarity and accurately conveys the experts’ feelings towards the increase in health problems.
Proper use of verb forms is essential for clear communication, especially in formal and academic contexts.
Therefore, "are concerned" is the appropriate choice in this sentence.