In response to another user making a comment on accessibility, I have transcribed the image into a post.
Treebeard:
The Ents cannot hold back this storm. We must weather such things as we have always done.
Merry Brandybuck:
How can that be your decision?!
Treebeard:
This is not our war.
Merry Brandybuck:
But you're part of this world! Aren't you? You must help! Please! You must do something.
Treebeard:
You are young and brave, Master Merry. But your part in this tale is over. Go back to your home.
Pippin Took:
Maybe Treebeard's right. We don't belong here, Merry. It's too big for us. What can we do in the end? We've got the Shire. Maybe we should go home.
Merry Brandybuck:
The fires of Isengard will spread. And the woods of Tuckborough and Buckland will burn. And all that was once green and good in this world will be gone. There won't be a Shire, Pippin.
If it makes you feel better, and you didn't already know, that didn't really happen in the books. They decided to march to war on their own with no hesitation and no conversation about it with Merry and Pip.
Well they did have the Entmoot, so there was plenty of deliberation. It still seemed like a quick decision on the timescale that Ents live by though.
They also had that forest dance to get pumped up for the war which I still feel was a missed opportunity for the film.
Yeah, I am aware unfortunately, because it just makes it worse. I see what he was trying to do though, with the play on despair and then the "hype" of the Ents joining in. It just feels sloppy every time I watch it though.