They will want to know how this affects or could affect them personally, hits their family directly or anyone else they know, and then they will focus on the impact of their community. Representatives from the business community will focus on the bottom line for their company and employees. Encourage your audience to become active on the issue. Urge them to inform others and take positive action to address the problem. Talk a little louder than you think you should.
Most people speak too softly and the result is often mumbling.
Speaking up can also make you feel less nervous. Force the audience to visualize. The listener's mind is hungry for pictures. A friend of mine once told me . . . Pauses are perhaps the most effective technique for regaining the attention of the audience.