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New research challenges the generally accepted belief that substantial ice sheets could not have existed on Earth during past super-warm climate events. The study by researchers 31 Scripps Institution of Oceanography at UC San Diego provides strong evidence that a glacial ice cap, 32 half the size of the modern day glacial ice 33 .existed 91 million years ago 34 a period of intense global warming. This study offers valuable insight 35 current day climate conditions and the environmental mechanisms 36 global sea level rise. The new study examines geochemical and sea level data 37 from marine microfossils 38 on the ocean floor 91 million years ago during the Cretaceous Thermal Maximum. This extreme 39 event in Earth's history raised tropical ocean temperatures to 35-37°C （95-6°F）, about 10°C （18°F） warmer than today, thus 40 an intense greenhouse climate.
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