The sentence "The above facts prove that everybody needs to learn English if he likes to greet the global era" can be rewritten in the passive voice as "It is proven by the above facts that English needs to be learned by everyone if they want to greet the global era."

In grammar, the passive voice is a verb construction that is used to describe an action in which the subject of the sentence is the recipient of the action, rather than the performer. This means that the subject of the sentence is not performing the action, but is instead being acted upon. For example, in the sentence "The ball was thrown by the boy," the boy is the one performing the action (throwing the ball), but the ball is the subject of the sentence, so it is written in the passive voice. This construction is often used to focus attention on the object or recipient of the action, rather than the performer.