She cares about the environment.
we always use "about" with "cares".
The most common meaning of about as a preposition is 'on the subject of' or 'connected with'.
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ND1-2-2023
Encumber: رکاوٹ
Unburden: بوجھ اتارنا
"a red letter day" means "a special, happy, and important day that you will always remember"