the gaia hypothesis gaia hypothesis. james lovelock 1979 earth is a “super organism” it is alive...
TRANSCRIPT
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The Gaia Hypothesis
Gaia Hypothesis
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James Lovelock 1979Earth is a “super organism”
It is alive
Like one single organism
Name is from Greek Earth Godess - Gaia
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One step further than “Mother Earth”
Lovelock is a reputable scientist with a hypothesis that is pretty far out
Proposed as a testable scientific hypothesis
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“ Gaia is a complex entity involving the Earth’s biosphere, atmosphere, oceans, and soil; the totality constituting a feedback of cybernetic system which seeks and optimal physical and chemical environment for life on this planet”
James Lovelock
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How Does Gaia Work?
Life regulates the climate and atmosphere at an optimum for itself
Homeostasis
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But, the earth is mostly dead rock. How can it be alive?
A redwood tree is mostly dead, but it is very clearly alive
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Homeostatic Mechanisms on Earth
Atmospheric chemistry is tightly controlled by GaiaAt 25% oxygen fires would be very much more
frequentLess than 21% oxygen would prevent multicellular
animal life
Temperature controlAlbedo – reflectivity of earthClouds prevent heating of earth
Heat produces clouds because of increased evaporationJames Lovelock with David S.
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Lovelock’s Arguments for GAIA
Human activities will not affect the Earth permanentlyGaian homeostatic
mechanisms will control Earth’s environments
The problem is that Earth’s reaction to human activities may actually threaten our existence
The Hour with James Lovelock
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Discussion Questions
What are the major points of the Gaia Hypothesis?
According to the Gaia Hypothesis, how is Earth unique?
What is climate change a sign of?
What are the implications for Canada according to Lovelock?
Does James Lovelock feel he is listened to by others?
How and why do people disagree with Lovelock?
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Assignment
Do you agree or disagree with the Gaia Hypothesis?
You are required to use at least 3 references from the video or readings below to support you stance. Be sure to use proper referencing format.
http://www.guardian.co.uk/science/2008/apr/28/scienceofclimatechange.biodiversity
http://www.gaiatheory.org/overview/