a magnifying glass and just was burning a hole in the ocean in that spot, right along the equatorial pacifific. corals bleached, died. my colleagues stopped counting corals, dead corals, after they got to something like 1,900 dead corals. we thought corals in the middle of the ocean were protected because the stress was coming from the land around them, and that was, likeke, ringing the el alarm bells. alling: there was no corals living. it had been so hot. we had looked at the noaa sea surface temperature maps, and it was clear that for 8 months, a hot spot due to climate change sat on that reef and the corals died, and it was striking. van thillo: global warming was well-known, but t most people dd not dare to say this was global warming, although, foror us, ths was a complete e sign that there was global warming. dustan: imagine you as a human being. we increase your body temperature b by two degrees, yu have a fever,r, right? we incree it by ananother two o degrees, d yoyou're dead. that's what's happening to the reefs. if you recover from your fever, you can go on to be a perfectly health