Learn Italian: Bisogna educare coloro che amano il consumismo. - It is necessary to educate those who love consumerism.

Both mean "those who," but coloro che is slightly more formal and elevated than quelli che. It is also gender-neutral and is exclusively used to refer to people. Because this sentence discusses a societal concept ("educating those who love consumerism"), the slightly more formal coloro che fits perfectly.

Could I use chi instead of coloro che here?

Yes, but it requires a grammatical change. The pronoun chi also means "those who" or "anyone who," but it always takes a singular verb. If you used it here, the sentence would become Bisogna educare chi ama il consumismo.

Why is bisogna followed directly by educare without a preposition like di?

The impersonal verb bisogna (one must / it is necessary) is always followed directly by an infinitive, with no preposition. Learners often confuse this with the expression avere bisogno di (to need), which does require di. Since we are using the verb bisognare here rather than the noun bisogno, no preposition is needed.

Why does "consumerism" translate to il consumismo with the definite article?