End of the World

There are a few movies that depict a future where planet Earth is becoming non-hospitable. Either mankind has run out of Earths resources or just overpopulated the planet kind of like Elysium. What happens then, where does mankind turn when the place we have called home for centuries is gone? Do we make a giant spaceship like Wall-E and just live out our lives in it, or do we go around looking for a new place to stay and possibly colonize a new planet.

Well why would we have to leave, I mean, Earth is great so the only reason we would permanently leave is if something was forcing us to leave. One factor could be that the sun is burning out. The sun will eventually go dark, but not for millions and millions, which gives us time. Hopefully by then we have a plan B that can save us. By that time we possibly could have a concept that "re-energizes" the sun, keeping it going, making it so we did not have to go anywhere. This defeats the need to leave which means something else has to kick us off the planet.

Another possibility is that we have overpopulated the planet. Assuming the population will continue to grow at the rate it is growing this is a very real possibility that isn't so far away. Hopefully, the solution isn't kill off a third of the population, and lets say that castrating a third of mankind isn't the solution either. Some would definitely need to leave the planet and look for another home. Who? I don't know, but staying on Earth after awhile would probably be just as safe as travelling into space and searching for a home.

The most ideal out of all of the scenarios is most likely we would build a giant space station or ship that could hold a majority of the population. We already can grow food in 0g, but we cannot really live our lifetimes in 0g. Our bodies are built and grow because of gravity. Extended periods of time without gravity really messes with our bone structure and other parts of the body. We could survive, but we would most likely be extremely weak and frail and just messed up. But if we were to stay alive this is possibly the only way to do so, but let's hope that we don't get forced into these situations.