It's always been at risk and always will be. Maybe you learned about previous mass extinctions and that a big eruption is all you need to wipe us out. Earth will still be here though. I throughly agree with you regarding the lack of meaning, but I disagree there's meaning in the colony. There's no meaning, there's just nature.

What about our nature? I don’t believe there isn’t meaning, only what we as humans apply. If an ant applies meaning, it still counts. Just might be less than we can perceive.

There are indeed only two categories: either we say there's no meaning at all (and at the scale of the universe it definitely looks so) then there's no difference between a human and an ant, we're all nothings. Or, we say there is a meaning in humans, then we must give meaning also to smaller critters like you suggested, just don't look at the scale of the universe :) Or of course, we accept meaning as a very local thing then everybody can redefine their own, even the ants which would surely say "what a meaningless thing is that hooman colony New York".

I believe that meaning is derived by the living organism. I imagine ants to have a form of OCD where they feel the fear if they don’t do what they are compelled to do.

Humans think they have free will. I don’t think so, we all do what we are compelled to do (and that could just be follow the herd)