The Evolution of Science Fiction discussion

Hello fellow readers. I have a problem. A memory problem.

I can't stop thinking about what I believe is a story within a novel. I believe it is contained in Vonnegut book because I was reading many of his works at the time. Bear with me, I'm not sure if I will make sense.
The story I'm referring to is more of an idea: I remember reading something about Earth dying out. People were scarce and to move onto another planet or "heaven" or a better condition, you had to die. But in this scenario, people weren't waiting around. They were dying by suicide. It spoke of families dwindling down slowly. I believe it also spoke of people sitting in their garages with the cars on.
I recall a character having conflict with this. Wanting to go and be with everyone, but not wanting to leave Earth.

Is this story/idea familiar to anyone? Is it Vonnegut? Bradbury? It's been eating away at me and no search has turned up anything.

Help help help
Thanks
Nina

Hi Nina, i've read quite a few Vonnegut books but I don't remember this. It does sound like something that he would write though.

I know this isn't really an answer, but you could try whatsthatbook.com.

I've read a bit of Vonnegut and Bradbury. Your description doesn't put me in mind of any of theirs. I wonder if it could be Make Room, Make Room, which was the inspiration for the movie Soylent Green, but which I haven't read.

I've read Make Room! Make Room! & it doesn't match. I don't recall the story, though. Both Bradbury & Vonnegut wrote a lot of short stories, though. Could be one of them. It's been too many years since I read most.

kinda reminds me of CS Lewis's brief description of alien colonies on the moon. that was in his Space Trilogy