This is the 4330th most frequent Russian word.
беспокоиться
To worry or be anxious.
The word 'беспокоиться' here expresses concern or worry about one's own health.
Она беспокоится о своём здоровье.
She is worried about her health.
In this sentence, 'беспокоиться' conveys the importance of being attentive or concerned about the state of the planet's future.
Нам нужно беспокоиться о будущем планеты.
We need to be concerned about the future of the planet.
Here, 'беспокоиться' denotes the action of becoming overly concerned or stressed regarding minor matters.