If the audience I am writing for is not particularly interested in my topic, what should I do to pique its interest?

For example: if the student is writing a twelve-page research paper about ethanol and its importance as an energy source of the future, would she write with an audience of elementary students in mind?

Often, one changes her style, tone, diction, etc., when presenting to different audiences.

These are two extremes on the pendulum-course that is audience; the former is too narrow of an audience, while the latter is too broad.