The
Gaia Hypothesis, first presented by British scientist
James Lovelock, holds that living organisms have in some way taken charge
of the atmosphere, stabilising its chemical make-up to favour life on
Earth. The planet's thermostat is in biological rather than geological
hands and the atmosphere, has become a "cybernetic extension of
life".
Although
New Age groups have latched onto the hypothesis, claiming Gaia as some
sort of earth mother, the hypothesis does not consider the
planet to be a metaphysical, self-aware entity. It views earth's living
systems as synergistic, interactive and self-regulatory, rather than
discrete and independent systems.
To a large
extent, it's common sense. Humans are dependent on both living systems,
from the microbial world inhabiting our gut, to the food we eat, and
non-'living' systems: the air we breath, the water we drink and the
chemical composition of the soil in which the living things that we
eat grow.The Linnean classification system groups living things into
separate categories in order to better understand the relationships
between them. Whilst it is a brilliant system, by its nature it promotes
pigeon-hole thinking. Darwinian evolution also promotes linear thinking.
Humans chose to classify things in neat little boxes, be they
progressive, like Darwinian evolution, or lateral, like Linnaeus' classification
system, in order to understand our world. But outside the science classroom,
the real world functions in a considerably more complex fashion.
At its
simplest level, animals need 02 to function, and exhale C02. Plants
'inhale' C02 and produce 02. Plants and animals therefore depend on
one another for survival, using a non-living medium to exchange necessary
elements: the air. Therefore the atmosphere is necessary to the relationship
between living entities. Now, extrapolate that simple concept across
all systems on the planet, from the shape of the land, which influences
the weather, the geology, which provides a chemical component to the
soils, and so on, and it becomes immediately obvious that the entire
planetary system is interactive and dependent, it cannot possibly be
understood by examining the constituent parts in isolation from one
another. That is reductionist thinking and it simply does not work in
the real world, or indeed, the world of science (as quantum physics
so aptly demonstrates). The Gaia hypothesis was the first attempt to
view the biosphere as a whole. It is both good science and a good metaphor.