This is the 843rd most frequent Japanese word.
懸念
Concern; worry; fear.
懸念 refers to worries or concerns about a particular subject, in this case, a decision.
彼の決定に対する懸念が残っています。
Concerns about his decision remain.
懸念 emphasizes a personal feeling of worry or unease about a situation.
懸念していた問題が解決されて、安心しました。
The issue I was concerned about has been resolved, so I feel relieved.
懸念 is used to describe widespread concerns or apprehensions, in this case, regarding environmental issues.