By EarthWorks Group, Sophie Javna

ISBN-10: 0836223012

ISBN-13: 9780836223019

As a child, I consistently learn this ebook, and it encouraged me to make alterations and examine technique to be extra environmentally pleasant. i lately got this booklet remembering how impactful it used to be to me as a child.

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Additional resources for 50 Simple Things Kids Can Do to Save the Earth

Example text

David Wilkinson’s point above is apropos here: that positive feedbacks will in general be bounded in extent and time by longer-term, stronger negative feedbacks. I agree, although in the case of Ice Ages the bounds might have been set by the orbital cycles themselves. I do generally agree, however, with his point: Gaia is a system with both types of feedbacks, and the system will tend to settle into stable states bounded by negative feedback. Thus naturally there will be steady states in which life plays a major role.

Here is how I have come to see the Gaia system: The biosphere is a vessel containing chemical reactions. There are flows of matter into this vessel (considering input flows from volcanoes and rock weathering). As described in the example of lively BLAG, life can influence the weathering rate, which puts elements from rocks into the circulation of the Gaia system. In addition, there are exiting flows from the biosphere vessel, primarily by the burial of materials in sediments and by chemical exchanges at ocean vents.

Citing the fact that many systems, including planets without life, return to a stable state after being disturbed. The fact that Gaia possesses stable states may not be remarkable, but the habitable 17 Clarifying Gaia nature of those states (which change over time) and the means by which self-regulation is achieved in such a complex system are fascinating scientific questions. The system not only responds to changes in its environment, but its feedback structure is continually being transformed by evolution occurring within it (Lenton and van Oijen, 2002).

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50 Simple Things Kids Can Do to Save the Earth by EarthWorks Group, Sophie Javna

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