Although this strategy is often overused, asking a few key questions is a good way to introduce your argument. Be cautious, however, of posing any that will not be answered: doing so sets up false expectations. For example:
How many times have you looked at a city street and seen it draped with power lines going in every direction? How many times have you seen housing developments intersected by huge power lines which radiate dangerous levels of high voltage? How many times have you driven the open country only to find miles and miles of steel towers connected by strands of power lines?
If you're like me, you notice these things. To me, they happen to be aesthetically unpleasant. What we don't see is where or how the power within those lines is generated. Chances are it is not good. Over 85% of our current energy source is derived from fossil fuels (RE fact sheet 1). What if our power source wasn't harmful to the earth? What if it was coming from the sun and wind, and didn't harm the people in the neighborhoods who used it?