Part 1 TMoore Artificial Photosynthesis 22 Oct 2018
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Transcript of Part 1 TMoore Artificial Photosynthesis 22 Oct 2018
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Figure 1 | Milankovitch cycles. In 1976, Hays, Imbrie and Shackleton1 provided the first clear evidence that variations in Earth’s orbit around the Sun dramatically change our planet’s climate, a concept known as the Milankovitch theory2. There are three types of variation: eccentricity, obliquity and precession1,2. a, Eccentricity describes the shape of Earth’s orbit around the Sun, and varies from being almost a circle to an ellipse, with a period of about 96,000 years6. b, Obliquity is the tilt of Earth’s axis of rotation with respect to the plane of its orbit, and it oscillates with a period of about 41,000 years6,8. c, Both Earth’s rotational axis and its orbital path precess (rotate) over time — the combined effects of these two components and the eccentricity produce an approximately 21,000-year cycle6,7.
In Retrospect Forty years of linking orbits to ice ages
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