There is nothing like reflecting on the entire span of our planet's
history to get some perspective on where we, as a species and
civilization, are today. The study of this immense period of time, and
not merely the relatively brief history of mankind, is amongst the most
insightful and beneficial parts of any person's education. Too many of
us are only interested or preoccupied with the recent history of
humanity, for example from the beginning of the industrial revolution
and the birth of modern nation states. Undeniably, the geopolitics of
today have been predominantly shaped by the events of the previous
centuries, especially since the first World War. Analyzing this period
is perhaps useful for making short term general predictions of the
positioning of each country viz-a-vi one another in the next few years,
but to look further ahead at where we as a global society is headed we
need to dig a little deeper. I will come back to the 20th century again,
if only to highlight the extremely rapid changes wrought by our species
on Earth in a relatively short span of time. To really understand where
we've come from, it is useful to look back much further, beyond the age
of civilizations, past the paleolithic even, when we lived as
hunter-gatherers for perhaps a hundred thousand years before agriculture
was invented. I am speaking of geological epochs, the time scale at
which the evolution of life takes place i.e. millions of years.
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Source: http://nautil.us/issue/17/big-bangs/the-greatest-animal-war |
The
Earth has a history of some 4.5 billion years, but life really only
took off with the Cambrian explosion some 550 million years ago when
large bodied multicellular organisms rapidly colonized first the oceans,
then the land. This means for almost 90% of its existence our planet
was a barren, lifeless rock (if we exclude simple single celled life).
Despite the conditions being suitable for life to arise, like the planet
being in a sweet spot in terms of distance from the sun, for water to
remain in liquid form, for instance, for almost four
billion
years there was nothing substantial beyond archaic bacteria-like life
forms. To keep the story short, the onset of complex life led to the
spread of ever larger and more complex biota, culminating in the era of
dinosaurs, before they were unceremoniously wiped out by an asteroid
strike from space. One wonders if that had not happened what would be
the state of life on Earth today, and if intelligent, sentient beings
like ourselves would still have eventually evolved. Perhaps if that
evolutionary trajectory had not been disrupted it could have brought
forward sentient life by millions of years, instead of resetting the
clock back to zero but allowing mammalian life to fill the vacuum and
inherit the Earth. But I digress!
In any case, it took another 63
million years give or take, for our planet to produce walking apes that
would eventually lead to hominids and us, "only" around a million years
ago. We were rather insignificant as a species for the majority of that
time, just another large bodied mammal trying to make a living from the
land, in competition with the suite of various mega-fauna of the time
like cave lions, dire wolves and mammoths to name just three. With the
discovery of fire and refinement of tool use humans dispersed out of
Africa and gradually spread out worldwide to every continent. Still, our
numbers remained small and impact on the environment was localized and
negligible, if we conveniently overlook the extinction of mega-fauna
that have been attributed to our competitive edge.
Things began
to pick up with the dawn of farming around ten thousand years ago, which
allowed our population to rise rapidly as settlements expanded and
technological progress gathered pace. However, for thousands of years of
civilization, we could only rely on the energy from ourselves, other
creatures, the sun, wind, and living plants to do our bidding. It was
only with the unlocking of energy from fossil fuels, accumulated
underground since the beginning of life on Earth (i.e. hundreds of
millions of years worth) that we really took off, quite literally. One
has only to look at charts of world population, GDP and energy use to
see the exponential growth of our species, particularly in the last
century and more so post-WW2. In 1900 there were about 1.6 billion people, we
are at
seven billion today, all in a mere hundred years.
Economic and industrial output growth are even more rapid, driven by
associated massive inputs of material and energy resources. Which brings
me to the point of this essay - that it is simply impossible for our
current path of expansion to last much longer.
Exponential growth
of any sort has the effect of compressing time, as the underlying
subject increases in a geometric progression. Each doubling of number
requires a shorter period as the base expands. Looking back at the
history of life on Earth and the sheer stretch of deep time that has
passed, one can be fooled into thinking there is ample time still for
something to happen, perhaps the discovery of a new energy source, or
the ability to colonize other planets that will once again push those
annoying physical resource limits away from their current constraints on
carrying capacity. But the enemy of exponential growth is against us in
this fight. We just do not have another thousand or even a few hundred
years to figure a way out of the limits of a finite Earth. I venture
that in all likelihood we don't even have another hundred years. Before
this century ends, i.e. within our children's lifetime, things would
have to come to a head. This is no mere hysteria on my part without
substantiation or deliberate, rational analysis. In all but a few of the
multiple scenarios generated by a sophisticated model from the authors
of 'Limits to Growth'*, some sort of collapse is forecast before the end
of the 21st century. To summarize their analysis, even if we were to
take collective action quickly and invent practical technologies without
further delay, we will inevitably come up against limits of one sort or
another to further economic expansion. There has to be a sea change in
mindset away from the goal of perpetual material growth if we are to
avoid the inevitable downward 'adjustment' in ecological carrying
capacity. Yet the majority of us blindly go about our individual lives
without any seeming concern or awareness of the cliff looming ahead of
humanity. We continue to strive for the next career advancement, upgrade
our houses, our cars, put our kids into prestigious institutions so
that they may become even more materially well-off,
ad infinitum. It is truly mass insanity, truth be told, as we step on the accelerator even whilst headed for the precipice.
From
a lifeless rock and empty world, to one filled to brimming with humans,
but all the impact on the planet has come about within the last hundred
years, a blink of an eye as they say, in the enormous span of
geological time. How long will the Anthropocene (Age of Man) last? At
the rate we are going it could be just another blink of an eye. Just
take a look at those population and world economy charts, the way the
lines on the graphs rocket almost to the vertical, and tell me if you
think otherwise.
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And we have lift-off! |
*Donella H. Meadows, Dennis L. Meadows, Jorgen Randers, Limits to Growth: The 30-Year Update (Chelsea Green Publishing, 2004)