The idea of finding another Earth is not so much about moving everyone from Earth to somewhere else, but rather about "backing up" our species and civilisation in additional places. If an asteroid is going to wipe out Earth, we can't evacuate 8 billion people, or even 8 million people. but if we had a few generations of colonists in domes on Mars, or floating in the clouds on Venus, or somewhere else, the species itself would hopefully survive.
We only have one Earth, and its the best home we could hope for. But we're crazy to keep all of our existential eggs in a single basket and hope it all works out.
> If we can make Mars habitable, we can make Earth habitable for far less cost.
That said, I absolutely love this sentence.
Although I would say, the technology we ultimately have to develop to survive on Mars or the moon will certainly help us keep Earth habitable.
We only have one Earth, and its the best home we could hope for. But we're crazy to keep all of our existential eggs in a single basket and hope it all works out.
> If we can make Mars habitable, we can make Earth habitable for far less cost.
That said, I absolutely love this sentence.
Although I would say, the technology we ultimately have to develop to survive on Mars or the moon will certainly help us keep Earth habitable.