Climate change, war, and poverty are complex issues with far-reaching effects. Communicating health risks about these issues, while separating fact from fiction, has grown more challenging; cultural differences, political motivations, and new media platforms complicate this further. The public is uncertain who and what to believe. How do we share new genetic research? How do we reveal the hidden dangers of pollutants in our food, homes, and neighborhoods? How do we ethically persuade people to heed warnings of imminent threats, such as epidemics and extreme weather events?