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Re:Show HN: A WebGL visualization to show how global tempera... by euyyn on Monday September 12, 2016 @01:14AM (#12477344)
1998 looks like an inflection point. Before then, you'd see blues and reds; after that, it's mostly just red everywhere. What's up with that?
Re:Show HN: A WebGL visualization to show how global tempera... by more_original on Monday September 12, 2016 @05:38AM (#12478296)
In 1998 there was one of the strongest El Nino events.

https://en.wikipedia.org/wiki/1997%E2%80%9398_El_Ni%C3%B1o_e...

Maybe this made for a sudden increase, rather than a more gradual one.