Scientists have discovered that Earth’s oxygen won’t last forever—one day, it will disappear, making the planet unlivable for most life. They predict that in the far future, Earth’s atmosphere will be filled with methane instead, just like it was before complex life existed. This means almost all living things, including humans, would suffocate without oxygen to breathe. The process is inevitable, so scientists say we have two choices: find a new planet to live on or figure out how to survive without oxygen. This won’t happen for at least a billion years, but it shows how fragile life on Earth really is. For now, we’re safe—but in the distant future, Earth could become a deadly trap!

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