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PLANET EARTH: FRAGILE AND EVER-CHANGING Ashok Sahni INSA

PLANET EARTH: FRAGILE AND EVER-CHANGING Ashok Sahni INSA Senior Scientist ashok.sahni@gmail.com. Earth is 4650000000 yrs old; Life 3500000000 yrs, Industrialization 300 yrs. 121C to-167C Int. Space Stn. Thermal Regime for a Living Planet.

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Lecture 17

Lecture 17. Tectonic-scale Climate Change. Greenhouse / Icehouse Earth (Part II, p. 84-85; Ch. 4, p. 86-91). Geologic Time Scale. No ice sheets on land. Ice sheets on land. *. *. *. *. *. *. Ice House. Tectonic-scale Climate Change (Ch. 5, p. 103-112). Hundreds of millions of years.

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Snowball Earth

Snowball Earth. Snow Ball Earth between 750 and 600 million years ago. 2 Billion years ago O2 began forming in the atmosphere. CO2 has been a driver of Climate for Millions of years. (phanerozoic 550 Mya to present) There have been large ice sheets during the Phanerozoic ~300 Mya

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384 views • 12 slides

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Greenhouse earth - PowerPoint PPT Presentation

PLANET EARTH: FRAGILE AND EVER-CHANGING Ashok Sahni INSA

Lecture 17

Snowball Earth