This is the 4555th most frequent Portuguese word.
consideram
"Consideram" means "they consider" in English.
Here, 'consideram' is the verb 'consider' in third person plural present form, indicating evaluation or thinking about something.
Eles consideram a proposta interessante.
They consider the proposal interesting.
'Consideram' conveys that the subject ('people') thinks preservation of nature is important, denoting appreciation.
As pessoas consideram importante preservar a natureza.
People consider it important to preserve nature.
In this sentence, 'consideram' indicates that the students perceive or judge something based on their understanding.