Having been a diver on the Great Barrier Reef numerous times, the scale of bleaching events means that there is often no non-bleached neighbour for vast distances. Healthy propagation rarely occurs before the brown sludge sets in, then its game over.
This kills me. I saw the reef for the first time around 2007. I went back twice, and the last time I was there (2017) I honestly couldn't believe what I saw. Wasteland? An under water desert? I don't have words for it, but I don't really want to go back because it hit me so hard. Our planet is dying and we're sitting here debating why/who and not doing anywhere near enough to fix it.
I'm so glad we have space rockets, flying cars and drone warfare...but I'd trade it all in for the reef to come back.