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We could begin to terraform mars to have an additional place for humans and some other animals and plants trees etc to live. That alone is worth it in terms of insurance.
It is 100% likely that by going there we will find and invent countless new helpful devices and procedures that will impact millions or more lives here on Earth.
A whole new economy could end up forming around some of those inventions.
Keep in mind that before too long, we will see harvesting of asteroids etc, likely to be brought to the moon first. processed, waste material easily buried and sealed. Final material back to Earth. Economies will change.
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