Decide what you are calling for and keep repeating it clearly and concisely. Don’t dilute strong arguments by going off on tangents or harping on trivialities. Relate your cause to everyday concerns. For example, if you’re campaigning for ethical investment, point out that it is financially viable and has a positive effect on the world. If you speak calmly and appeal to common understandings, radical ideas can appear not only sensible but even obvious.