When Felix was five years old, he got a present: it was a stuffed polar bear, almost as big as himself. Four years later, when he prepared a presentation about the climate crisis for his classmates, he realized that his beloved polar bears were in danger. He came up with a simple but effective solution for the problem: planting trees. He started working on this project with just his classmates, but soon other schools joined in. That was the beginning of Plant-for-the- Planet, an organization that today has over 75,000 members and has planted more than 14 billion trees. But Felix has more ambitious plans: he wants to plant one trillion (that is, one thousand billion) trees all over the world. “Planting trees is the easiest thing we can do to alleviate the climate crisis, and everyone can contribute,” he says.