This is the 12851st most frequent Portuguese word.
vivermos
"Vivermos" means "for us to live" or "we live" (in the subjunctive or infinitive sense).
In this sentence, 'vivermos' is used in the subjunctive mood reflecting a hypothetical or desired action for us (inclusive).
É importante que vivermos de forma mais sustentável.
It is important that we live in a more sustainable way.
Here, 'vivermos' emphasizes the way we (inclusive) currently live, tying it to the conditionals presented in the sentence.
Se quisermos viver melhor, precisamos primeiro mudar como vivermos hoje.
If we want to live better, we must first change how we live today.
'Vivermos' in this context denotes the action of living together, introduced by the conjunction 'para que', which expresses purpose.