This is the 11132nd most frequent Swedish word.
medveten
Aware; conscious.
Here, 'medveten' is used to describe an intentional state of being aware or thoughtful regarding actions or choices.
Hon försöker vara mer medveten i sina beslut.
She tries to be more conscious in her decisions.
In this sentence, 'medveten' is used to express consciousness or awareness about something specific, which are 'misstag' (mistakes) in this case.
Han är medveten om sina misstag.
He is aware of his mistakes.
In this usage, 'medvetna' (plural form) conveys that the children understand or recognize the significance of recycling.