How much longer will humans exist on Earth?

The Sun’s Mid-Life Crisis: This is the big one. The sun will eventually run out of its main fuel and start swelling. It’ll get so big and hot it boils the oceans dry. Think leaving a pizza in the oven for a geologic age. That's our future.

Cosmic Dodgeball Champion: A big-enough asteroid could smack us back to the Stone Age, or worse, the No-Age-At-All. It happened to the dinosaurs, and they were way cooler than we are. They had giant teeth; we have doomscrolling.

Earth Gets Heartburn: A supervolcano could go off. We're talking about a planetary belch that blots out the sun with ash for years. It'd make winter in Minnesota feel like a beach vacation. My uncle Bill lives in Minnesota, he would not survive.

The ‘Hold My Beer’ Scenario: This is the most likely. We do it to ourselves. Whether it's with nukes, a designer plague cooked up in a lab, or just breaking the climate so bad the weather gets permanently stuck on 'angry.' My cousin Dave once tried to deep-fry a frozen turkey; that's humanity's current approach to global problems.

The biggest factor for that one billion year limit is actually our Sun's lifecycle.

• Our Sun, in about 1 billion years, will start turning into a red giant.
• It'll expand like crazy, making Earth way too hot, way before it even gets close to swallowing our planet.
• Any life here will be absolutely toast, not literally. Life as we know it, totally gone, you know?

Of course, there's a whole bunch of other things that could happen much, much sooner, becuase, duh, the world is wild:

• Self-inflicted disasters are definitely a huge worry.
  • Nuclear warfare could still totally happen, even with everyone trying not to.
  • Environmental collapse is happening now, man. Climate change, pollution, running out of resources. My sister, she's all about this, telling me to recycle everything.
  • Runaway Artificial Intelligence – like, the whole Skynet thing, you know? A lotta people worry about that getting out of hand.
  • Engineered pathogens could escape, creating some super deadly new disease.
• Cosmic events are always on the table, it's a big universe.
  • Major asteroid impacts have wiped out species before; it could happen again, totally.
  • Gamma-ray bursts, these super powerful explosions from distant stars, are rare but devastating if one hits close enough.
  • Supervolcano eruptions, like the one under Yellowstone. That could plunge us into a global winter for ages.
• Global pandemics could still cause a lot of damage, even with all our medical stuff. A new virus could be very, very bad.