Scientists , what's the most horrifying effects of climate change you can verify?

Maybe this is more related to the causes of cc, so for me one of the most unknown and horrifying is the forest defaunation, the lost of pollinators and seed-spreaders (ofc, between other ecosistemic roles) will be a hard hit in the survival of plants and the ecosistems. Also the acidification of the sea as a direct result of cc, will be catastrophic for so many organisms (they'll literally melt) so... Choose between those two which one is more horrifying