I am assuming "complete" was a typo and that the word "compete" is what you meant. In this case, compete is an active voice vers, because it is a verb that a subject is performing.
Active voice verbs are the opposite of passive voice verbs. Passive voice verbs are verbs that are done to the subject, as opposed to the subject doing them.
There are various ways production pollutes the Earth's environment but, crude oil spills vastly harm living organisms and food production to that keep them alive. something like that?
