The app has up-to-date game lines and keeps a running tally of overall wins and losses, but will people really find interest in making non-monetary wagers just for the right to brag to their friends and social media followings?
You want a guarantee of safety - not something along the lines of "if we peak at date X and reduce emissions at rate Y that gives you Z% chance of not being flooded out of existence".
Understand that we want soldiers on the front lines of battle to have the most up-to-date intelligence that's possible about the enemy that they face, the tactics that they use.