Is the Post-Apocalyptic Genre Considered Science Fiction?

As both a reader and writer of post-apocalyptic fiction, I’m fascinated by how it often merges with other genres. Take science fiction, for example. Some post-apocalyptic books feature a sci-fi component, while others do not. They play well together.

“Doomsday” fiction can blend with other genres as well — horror, fantasy, thrillers, you name it. But today, we’ll focus on one genre-related question in particular:

Are post-apocalyptic books considered science fiction?

The short answers i...