GGR 107 lecutre 9 - GGR 107 Environment Food and People...

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1 GGR 107 Environment Food and People Lecture Sept. 25 th Climate Variability, Past and Present
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2 Environment Food and People A note on reading Ponting and Lovelock. Prose and diagrams. Concepts, rather than formulae and details Critical thinking and critical use of sources
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3 Environment Food and People 1. Energy flows 2. Bacteria 3. Ecosystems 4. Climate variability
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4 Energy Flows There are many quite different manifestations of energy, but, ultimately only one major source – the sun
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5 Source of geothermal energy Also nuclear energy Incoming solar energy
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6 Energy Flows Foundations of history’ Continental drift (Alfred Wegener 1915) - a brilliant, but inconvenient idea, like CC Astronomical cycles affect the earth’s orbit around the sun (Milutin Milhankovic 1920), hence climatic change, specifically ice ages
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7 Energy Flows The Milhankovic cycles : - The shape of the earth’s orbit around the sun – circular, elliptical - The proximity of the earth to the sun - The tilt of the earth’s axis
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8 Energy Flows Photosynthesis is ‘the process by which plants and certain types of bacteria create the chemical compounds essential for life. It is the only way that energy is introduced into the system (Ponting p. 11-12). (Note: we can also use solar energy for heating and for electrical energy.)
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9 Energy Flows The food chain Omnivores Carnivores Herbivores Bacteria {Consumers and fermenters
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10 Energy Flows The bacteria are the first colonisers of the
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GGR 107 lecutre 9 - GGR 107 Environment Food and People...

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