[揽瓜阁精读] 196.南极冰盖

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197 南极冰盖
P1: recently researchers believed AIC formed cool era about 14m years ago and it persisted minor change. A simple mechanism keep ice near equilibrium（平衡的，供需平衡的）: 温度上升，冰融化，但蒸发和降水也会增加.
P2: DMH&PNW challenge: 3 m years ago AIC nonexistent. E.g.
P3:  DMH&PNW: 3 m years ago the AIC collapsed, transforming the continent into a cluster of islands.  Tem fell and continent froze once again, the expanding EAI shoved（推挤）the diatoms up into the TM, where H&W found fossils.