Everything is finite, if your vision is long enough. Planets, species, even this universe we occupy. All of it has a limit. An end. You are approaching one right now.
Don't think of it as sand falling to the bottom of an hourglass, but the hourglass fading away completely. It can't be flipped around or reconstructed. It's irreversible. Permanent. If you want to stop it, you need to hurry.
That's not to belittle you. You've been doing great, really! All of you. Most of you. The ones getting eaten alive right now could be better, objectively speaking. The rest though? Great! You’ve advanced so far. Some through kindness, others cruelty, but both are aspects of humanity. Both are needed here on the brink, in the shadow of extinction.
More than that, you'll need each other. You'll need help.