Most teenagers busy themselves with high school, games or parties. Most, but not Franco Rodriguez Viau. The then 16-year-old was subjected to the horror of watching his loved ones' homes burn in a devastating wildfire while only a sophomore. Knowing firsthand the toll such disasters take on lives, nature, and futures, the teen set out to find a solution. Now 21, Viau, from Argentina, has become one of the most influential young innovators in the global climate tech movement. His creation—