You can't. Even if you were a billionaire, the world is huge, populated, and is controlled by all kinds of people and companies (of various degrees of madness a

You can't. Even if you were a billionaire, the world is huge, populated, and is controlled by all kinds of people and companies (of various degrees of madness and power thirst). Pick one small problem and try and solve it, or improve it. Example: excessive CO₂ in the atmosphere. Possible solution: figure out how to plant fast-growing plants on a massive scale, ideally in deserts.