The term is meant to reflect the fact that humans are transforming the face of the planet as deeply as the asteroid did at the end of the dinosaur era, or as deeply as the Earth ripping open at the end of the Permian. Therefore, they argue, we can't call this era by the old biological or geological classifications; it is an era in which the chemistry of the air, the acidity of the seas, the temperature, the albedo, the animal and plant species, are all defined by humans. It is, they say, the Anthropocene.
Greer is not fond of the new term, and gives a good argument as to why, which I won't sum up here. I did, however, contribute my own thoughts:
You make an interesting point, JMG.
A bit of rumination on your theme: I’m not personally bothered
by the term “Anthropocene,” simply because all these divisions are, to a point,
imperfect teaching tools created by and for humans. Our divisions reflect a
physical reality, of course – there really is a K-T boundary about 65 million
years down through the rock, for example – but as you mention, they represent
modern scientists building on and adapting the terms handed down to them from
their predecessors, who did the same, back to the beginnings of science.
Someone doing the whole thing over from scratch might make
the major division the Great Oxygenation Event – or the Iron Rain, as I call it
when teaching my daughter – when the seas and sky became saturated with oxygen.
It would be about halfway through the Earth’s history, and it changed the
planet in what, for us and most living things, are the most tangible ways – the
seas and sky turned blue, the iron rained out of the sea, and most life was
wiped out. Or before and after eukaryotic cells, or Hox genes, or land
vertebrates, or any number of other game-changing developments.
Our divisions tend to be biased towards what we can see,
because we can see it, and biased toward animals rather than plants, because we’re
animals; the spread of mammals also coincided with the spread of flowers,
fruits and grasses, which changed the world more than mammals did, yet we think of the Age of Dinosaurs and the Age of Mammals. We divide
eras or divisions into single-digit groups of three or seven, rather than
thirty-three or five thousand and seven, partly because that’s what human
brains can remember.
I mentioned in a comment some weeks ago the difference
between fact and truth; facts are data, but how we put them together reflects
the truths we believe in. It doesn’t mean we’re not describing reality – we are,
and can back it up with evidence. But we can describe the same reality in a
number of different ways.
In other words, it’s like the debate over whether Pluto is a
planet – no one can deny that there are several large bodies and many small
ones orbiting the sun, but the inner rocky planets are small, solid spheres, asteroids
are smaller, solid potato-shapes, gas giants like Jupiter and Saturn are stillborn stars, and
Pluto and the comets are dirty snowballs with weird orbits.
We group the four rocky spheres and the four gas giants together
and call them “planets,” and possibly Pluto if we feel like it, but not the
asteroids or comets. The planets and their orbits are proven facts; how we
group them with our human language reflects our human truths. We group them
into eight or nine partly because we remember that a lot more easily than the
several million smaller bodies.
We called Pluto a planet when we discovered it
in the 1930s, partly because society believed in progress and wanted to
celebrate new discoveries, partly because the growing power of the USA in the
1930s wanted to claim its own astronomical discoveries, and partly because
Percival Lowell (whose initials, supposedly, were part of the reason it was
called Pluto) had long predicted there would be another planet out there, and
people thought Pluto was it.
What I’m getting to here is, if referring to the current
ecological disruption as an era helps us take it more seriously, call it an era
– it is from our human perspective. It won’t be an era to God, who -- as Aquinas pointed out -- exists outside
of time, but we
can’t second-guess Him anyway.
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