what narrative to chose

This depends on the audience. An audience equipped to work toward a healthy future might be better served with balanced narratives, allowing them to make decisions based on their own interests. Such narratives are likely to focus on demographic information and on incoming data (often statistical) about processes afoot. 

If you instead want to decide for (e.g. to simply manipulate) an audience, your narrative should be one-sided and focus on personalities or organism-centric anecdote i.e. on paleolithic triggers like fear, "bad-guys", and xenophobia. In this electronic information age, the gullibility of audiences to these strategies has proven itself again and again, from the invention of radio in the early 20th century through to today's internet of social media.