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This lecture series is presented here with the kind permission of the Rudolf Steiner Nachlassverwaltung, Dornach, Switzerland. Lib Document.

Human alteration of the N cycle and its environmental consequences

Dawson Bn , GA These lectures focus on the four Christian festival seasons, elaborating on the complementary nature of Christmas with Midsummer and Easter with Michaelmas. Version 2.

In , Rudolf Steiner founded the General Anthroposophical Society, which today has branches throughout the world. He died in Dornach, Switzerland.

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Convert currency. Add to Basket. Compare all 3 used copies. Book Description Rudolf Steiner Pr, Condition: UsedAcceptable. More information about this seller Contact this seller. Light rubbing wear to cover, spine and page edges. Very minimal writing or notations in margins not affecting the text.

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Possible clean ex-library copy, with their stickers and or stamp s. This is not a pedantic detail. Geology provides a strange picture of how the world works that helps illuminate just how bizarre and unprecedented the ongoing human experiment on the planet really is. Contrary to almost every popular account, Earth maintains an unusual surfeit of free oxygen—an incredibly reactive gas that does not want to be in the atmosphere—largely due not to living, breathing trees, but to the existence, underground, of fossil fuels. Shanan Peters, a geologist at the University of Wisconsin at Madison, is working to understand just how it was that our lucky planet ended up with this strange surplus of oxygen.

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At a presentation in June, at the North American Paleontological Convention in Riverside, California, he pulled up a somewhat unusual slide. That is, Peters wanted to know what would happen to the atmosphere if you burned down not just the Amazon, but every forest on Earth, every blade of grass, every moss and lichen-spackled patch of rock, all the flowers and bees, all the orchids and hummingbirds, all the phytoplankton, zooplankton, whales, starfish, bacteria, giraffes, hyraxes, coatimundis, oarfish, albatrosses, mushrooms, placozoans—all of it, besides the humans.

Peters pulled up the next slide.


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After this unthinkable planetary immolation, the concentration of oxygen in the atmosphere dropped from CO 2 rose from parts per million to —less, even, than it does in the worst-case scenarios for fossil-fuel emissions by By burning every living thing on Earth. To understand why requires a short tour of our planet. The two most abundant gases billowing out of volcanoes are water and carbon dioxide. The O 2 left over from this sorcery is released to the environment as waste. All but a hundredth of a percent of this photosynthetic stuff is consumed by creatures like us and many quite unlike us in the exact reverse process.

Animation: Yearly biosphere cycle shows earth 'breathing'

That is, we use up that same waste oxygen in order to burn that photosynthetic organic matter, whether by munching leaves, or flesh reconstituted from leaves, to steal that chemically captured sunlight for ourselves. We then release the original CO 2 and H 2 O back to the environment as exhaust. This process of respiration, this metabolic burn, represents a perfect and complete reversal of photosynthesis. That is, after a tree spends a lifetime producing oxygen and tree stuff, that oxygen is used up in its own undoing—by decomposers such as fungi, or by bugs and animals that eat its leaves, and by bacteria that respire dead stuff in the earth.

In the ocean, this unraveling is carried out by creatures that skim algal muck from the surface of the sea, and big things that eat one another, and bacteria that feed on the snowfall of tiny carcasses sinking through ocean depths, or larger ones resting on the seafloor.