Environment by quite a large margin compared to your other options. We are literally destroying the Earth and it needs to stop.
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Why? It's destruction and uninhabitability is inevitable.
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This isn't science fiction. It's not like we have somewhere we can just go.
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Well, that's why we have to find a place. In ~1.7 billion years the Earth will be too hot to sustain life. It's because of the life sequence of our star, not science fiction.
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1.7 billion years is quite a bit different than the couple hundred we have because of humans affecting the environment/climate.
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Ofcourse, but which is worse, something that can be worked around, or something that has no chance of being worked around?
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We won't have time to get to another planet if 100 nuclear warheads go off tomorrow. Let's get that in order first.
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So set them off? Trolololol
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I dun get it ;(
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Well it says what is currently our most important concern so I'd say environmental changes because we haven't worked around it yet.