The Earth immune system is a controversial proposal, claimed to be a consequence of the Gaia hypothesis. The Gaia hypothesis holds that the entire earth may be considered a single organism (Gaia). As a self-maintaining organism, Earth would possess an immune system of some sort in order to maintain its health.
Some proponents of this speculative concept, for example, hold that humankind can be considered an "infection" of Gaia, and that AIDS is an attempt by this immune system to reject the infection. "Cancer" might be a more accurate term, as humans evolved within Gaia, and are not external invaders. An opposite view is that humankind is Gaia's immune system itself, perhaps evolved to avert future catastrophes such as the Permian and Cretaceous mass extinctions of species.
James Lovelock's book "Gaia's Revenge" suggests that Gaia has many mechanisms for eliminating civilisations that do harm through greenhouse gas emissions and global warming, but suggests that with increasing heat being received from the sun, Gaia's ability to "bounce back" as it did after the Permian and Cretaceous extinction events, may be increasingly compromised.
Famous quotes containing the words immune system, earth, immune and/or system:
“The moral immune system of this country has been weakened and attacked, and the AIDS virus is the perfect metaphor for it. The malignant neglect of the last twelve years has led to breakdown of our country’s immune system, environmentally, culturally, politically, spiritually and physically.”
—Barbra Streisand (b. 1942)
“Welcome, all wonders in one night!
Eternity shut in a span,
Summer in winter, day in night,
Heaven in earth, and God in man.
Great Little One! Whose all-embracing birth
Lifts earth to heaven, stoops heaven to earth.”
—Richard Crashaw (1613?–1649)
“The moral immune system of this country has been weakened and attacked, and the AIDS virus is the perfect metaphor for it. The malignant neglect of the last twelve years has led to breakdown of our country’s immune system, environmentally, culturally, politically, spiritually and physically.”
—Barbra Streisand (b. 1942)
“In the course of the actual attainment of selfish ends—an attainment conditioned in this way by universality—there is formed a system of complete interdependence, wherein the livelihood, happiness, and legal status of one man is interwoven with the livelihood, happiness, and rights of all. On this system, individual happiness, etc. depend, and only in this connected system are they actualized and secured.”
—Georg Wilhelm Friedrich Hegel (1770–1831)