Definition of cli-fi in US English:

cli-fi

noun

  • A genre of fiction that deals with the impacts of climate change and global warming.

    ‘cli-fi, like the science behind it, often presents bleak visions of the future’

Origin

Early 21st century: short for climate fiction or climate change fiction, on the pattern of sci-fi.

Pronunciation

cli-fi

/ˈklīˌfī//ˈklaɪˌfaɪ/