PART ONE: THE PAST; THE ROLE OF CARBON IN THE EVOLUTION OF THE EARTH. |
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If a present day government anywhere around the world
didn’t know how much money it had; if it refused to keep a record of how much
income it received whether through taxes or income from nationalized industries,
etc; if it refused to calculate how much money it was spending, never bothered
to record what it was buying, and failed to tell people about its long term
spending commitments; if it made no attempt to pay off its debts or collect
debts it was owed; if it didn’t bother trying to discover either how much money
was in circulation in the country’s economy or its distribution amongst the
various classes within society; if it couldn’t be bothered to measure how much
money was coming in and out of the country; if it ridiculed the idea of keeping
a financial budget - let alone balancing its budget; if it ignored requests
that it should to ensure its own, and the country’s, long term financial stability
- then the vast majority of people in that country would regard that government
not merely as incompetant but utterly irresponsible, and perhaps even outright
loopy. And yet this is exactly what the brutish, and all other so called modern,
governments around the world are doing at the moment as afar as the Earth’s
Planetary currency is concerned. This currency helps to determine the stability
of the climate. The ecological bills which have to be paid to maintain the Earth’s
life support system and ensure the continued habitability of the Planet have
to be paid in this currency. This currency is also the basis of all life on
Earth; its availability determines the number of species on Earth, the population
of each species, the resources available for each individual in each species
and thus, ultimately, it determines not merely the quality of life, but the
survival, of all creatures on Earth - including humans. This currency is Carbon;
the currency of life on Earth. Quite staggeringly no government around the world
has any idea how much Carbon it is exporting (through pollution) nor how much
Carbon it is importing (through Photosynthesis); no government knows how much
Carbon it holds in stock whether in the form of Soils, crops, Forests, Phytomass,
Micro-organisms or Animals (including humans); no government has the slightest
idea of whether whether it is a net Carbon importer or a net Carbon exporter;
no government has a Carbon budget and none has the slightest interest in balancing
its Carbon budget (even though it is transparent that if all countries around
the world are net Carbon exporters then there will be an ecological disaster);
no government has the vaguest inkling as to what its future Carbon status will
be. Even worse, is that no government is concerned about what the Earth’s Carbon
budget has been, is, or will be. The world community is virtually indifferent
to the Earth’s Carbon currency even though rampant Carbon inflation (increased
global warming) or deflation (increased global cooling) both pose a threat to
the survival of the Earth’s life support system which, if it collapsed, could
lead not so much to the extinction of all life on Earth - although no one has
yet proved this is an impossibility - but to the extinction of that species
which occupies the top of the Carbon food chain. There is no better indication
of the irresponsible, senseless,and profligate way in which the world’s politicians
have been treating the Earth than their attitude towards Carbon. If Carbon is
the currency of life, then conventional politicians are the harbingers of death
carrying out a scorched Earth policy leaving vast areas of the Planet as lifeless
deserts, and turning the Earth into a gigantic gas chamber. They are, in effect,
the new nazis, the eco-nazis. They are not like the high-stepping, smartly uniformed,
rigidly disciplined, exterminators who, surreptiously and bureaucratically fed
millions of people into gas chambers. They are the beefburger and coke, the
coronation street and hollywood, the car and aeroplane, the shopping mall, loving
eco-nazis for whom glossy advertising has elevated the banality of evil into
the most desired way of life on Earth.
This chapter highlights some of the most important geophysiological
facts about the Earth. It is neither comprehensive nor detailed.
ONE: THE GEOPHYSIOLOGICAL FACTS OF LIFE.The conventional view of the origin of life on Earth is that
life first appeared in the shallow waters surrounding the oceans when a number
of basic chemical compounds were forged together by ultra-violet radiation from
the sun. The most obvious limitation to the theory of the terrestrial origin
of life is that all the natural elements which made up these chemical compounds
were not created on Earth but in space during the aftermath of the ‘big bang’.
More critical doubts about this conventional view have been expressed by John
Gribbin drawing on the work of earlier cosmologists, “one of the most important
developments in recent years in our understanding of the relationship between
life and the universe has been the realization that there may well have been
no need for life to get going from scratch on the surface of planet Earth. The
young planet may well have been seeded with, at the very least, much more complex
molecules than methane and ammonia, if not life itself.” (John Gribbin “In the
Beginning. The Birth of the Living Universe’ Viking, London 1993 p.59).
Gribbin argues that the first life forms discovered on Earth
appeared only a few hundred million years after the birth of the Earth. He suggests
this was too short a time for chemical compounds in the ‘primeval soup’ to have
been forged together to create organic life on Earth. Such a forging process
could have taken place in space. There is evidence of Carbon compounds in space
although no life forms have been detected, “Organic (carbon based) material
occurs in profusion between the stars of a spiral galaxy like our Milky Way”
(John Gribbin “In the Beginning. The Birth of the Living Universe’ Viking, London
1993 p.255). He believes the earliest life forms could have been brought to
Earth via meteorites. The Earth was certainly bombarded with vast blizzards
of meteorites during its formation, “Christopher Chyba and colleagues from Cornell
and Yale universities have estimated that soon after the Earth formed the amount
of organic matter raining down on it from space may have been as much as 10,000
tonnes per year; in just 300,000 years this would add up to as much mass as
all the living things on Earth today put together.” (John Gribbin “In the Beginning.
The Birth of the Living Universe’ Viking, London 1993 p.66). Gribbin concludes
that .. “only the most blinkered Earth-chauvinist would try to argue that life
got started from scratch on our own planet.” (John Gribbin “In the Beginning.
The Birth of the Living Universe’ Viking, London 1993 p.79).
Even more speculatively, Gribbin believes there is the possibility
that Photosynthesizers, not merely the simplest forms of life, could have been
created in outer space and ended up on Earth. He points out the anomaly that
Plants on Earth are green, “The colour depends on exactly which wavelengths
of sunlight are being absorbed, and green respresents the surplus radiation
which is not absorbed but is reflected back as visible light. Green plants use
molecules of chlorophyll to do their energy absorbing, using light in the red
and blue-violet parts of the spectrum and leaving most of the yellow and green
sunlight to be reflected away. This is very curious, because our Sun radiates
a great deal more energy in the yellow-green part of the spectrum than in the
red and blue-violet, and there are other compounds which could be used in photosynthesis
much more efficiently than chlorophyll.” (John Gribbin “In the Beginning. The
Birth of the Living Universe’ Viking, London 1993 p.93). In other words, if
Plants had evolved solely on Earth then logically they should be red and blue-violet
to make use of the most abundant source of energy. The reason why Plants can’t
make use of this greater quantity of energy is that the earliest Photosynthesizing
compounds evolved in space, where it was more efficient for them to use the
red and blue parts of the electro-magnetic spectrum. Once established on Earth,
green Plants flourished and prevented different types of Photosynthesizers from
gaining a foothold, “If Hoyle and Wickramasinghe are correct, then .. photosynthesizing
cells may have developed in space before life reached the Earth, and perhaps
chlorophyll is a much more appropriate pigment for the efficient absorption
of light under these conditions.” (John Gribbin “In the Beginning. The Birth
of the Living Universe’ Viking, London 1993 p.94).
The evolution of the Earth has been the process of extracting
Carbon from the atmosphere through the Photosynthesis carried out by Micro-organisms
and Plants. Photosynthesis has not merely produced many of the Planet’s abundant
minerals (calcium carbonate in carbonaceous rocks such as chalk and limestone,
dolomite, graphite, diamonds, fossil fuels, etc.), it has created some of the
Earth’s most impressive landscapes e.g. the white cliffs of dover, etc, and
is the foundation of the Earth’s chain of life.
I: The Change in the Level of Atmospheric Carbon.
Four billion years ago, after the Earth had coalesced
out of the debris of the ‘big bang’, the Planet’s atmosphere contained a large
proportion of Carbon dioxide. Today it consists primarily of oxygen, nitrogen
and a number of other gases which exist only in trace quantities - one of which
is Carbon dioxide. The amount of Carbon dioxide in the atmosphere has fallen
over this period from 30% to 0.04%.[1]
In effect the history of the Earth is the way in which this vast quantity of
Carbon has been removed from the atmosphere and transformed into a number of
minerals, landscapes and life-forms from the smallest of organisms to humans
and the charismatic Mega-fauna. The process was started when Micro-organisms
and Plants somehow acquired the ability to carry out Photosynthesis. These early
forms of life spread over the Earth and, over the aeons, diversified into a
profusion of species. As Photosynthesizers extracted more and more Carbon from
the atmosphere, they not merely provided a food supply for the evolution of
all other life forms but, through their decay (and the decay of the Animals
which made up the Earth’s increasingly fabulous chain of life), created the
vast quantities of fossil fuels and limestone deposits which have become the
basis of modern industrialized societies. The amount of Carbon they have extracted
from the atmosphere has been prodigious, “10,000,000,000,000,000 tons of organic
carbon has been stored in the Earth’s crust since photosynthesis began.” (Tim
Radford 'The Crisis of Life on Earth. Our Legacy from the Second Millenium'
Thorsons Publishing Group 1990 p.147).[2]
II: The Carbon Basis of Life.
Carbon is not one of the commonest elements on
Earth[3]
but it is one of the most crucial. It is one of the four main elements of life,
“There are excellent chemical reasons why hydrogen, oxygen, nitrogen and carbon
and not four other elements are the key elemental building blocks of life. These
are the four lightest elements that regularly exchange or share one, two, three
and four electrons.” (Preston Cloud ‘Cosmos, Earth and Man. A Short History
of the Universe’ Yale University Press New Haven 1978 p.146); Amino acids, the
foundation stones of life, are .. “made of the four life-building elements hydrogen,
oxygen, nitrogen and carbon ..” (Preston Cloud ‘Cosmos, Earth and Man. A Short
History of the Universe’ Yale University Press New Haven 1978 p.147).
There are, however, a number of other elements which are also
important in the evolution of life although they are not critical or essential
to all life-forms on Earth, “living things on Earth display a distinctive and
universal chemistry. They consist overwhelmingly of hydrogen, oxygen, nitrogen
and carbon, which, except for oxygen, are not among the most common elements
on Earth today .. 15 other elements .. are regularly involved in living systems
in small concentrations or trace quantities ..” (Preston Cloud ‘Cosmos, Earth
and Man. A Short History of the Universe’ Yale University Press New Haven 1978
p.273).
Although all four elements are essential to life on Earth it
can be argued that Carbon is by far the most important because of its unique
atomic, and molecular, structures.[4] . Carbon
is the only element which provides multiple linkages with other elements and
creates complex structures both of which enormously increases the number of
chemical compounds which can be created, “Carbon is the most complicated element
discovered so far in the solar system. It forms more compounds than all the
other elements combined. It is the building block of life.” (Ronnie Walker ‘Solar
Blue. The Reality of the Environmental Challenge’ The Self Publishing Association
Ltd Worcs 1991 p.106).
Carbon forms the backbone of all life forms. Without Carbon
it would not be possible to create the complex life molecule, dioxyribonucleic
acid or DNA, “Every DNA molecule is constructed in the famous double helix structure.
Two long chains, each built up from a carbon spine, twist around each other,
and pairs of molecules link up from one helix to the other, producing a structure
very much like a spiral staircase in which the cross-bonds are the steps. Each
individual DNA strand in the double helix is made up of many copies of just
four chemical building blocks, carbon based sub-units that join together like
popper beads. The four basic units of the DNA chain are collectively known as
nucleotides .. This four letter alphabet (of nucleotides) provides the basis
for the common DNA language of all living organisms on Earth.” (John Gribbin
“In the Beginning. The Birth of the Living Universe’ Viking, London 1993 p.81).
Without Carbon, and thus without the vast number and the vast
complexity of the chemical compounds it creates, then evolution would have to
take place within such a narrow band of chemicals and chemical structures that
it is highly unlikely that many life forms would have evolved. In many ways
the rich diversity of life on Earth is merely a reflection of the underlying
diversity created by Carbon’s promiscuous atomic and molecular structures. Without
Carbon, evolution would be so primitive as to be non existent. Evolution is
just the icing on the Carbon cake, “All life on Earth is based on carbon, a
very versatile element. Chains or rings of carbon atoms provide the central
framework of organic molecules in plants, animals and their derivative fossil
fuels.” (A J McMichael ‘Planetary Overload: Global Environmental Change and
the Health of the Human Species’ Cambridge University Press, Cambridge 1993
p.135). In these senses, Carbon is the key element of all life on Earth whether
Micro-organisms, Plants or Animals. Humans, as that well known Vulcan once described
them, “are a carbon based life form”.
III: Carbon’s Journeys.
Carbon is not merely the chemical structure of
life and the basis of evolution on Earth, it is constantly being used, recycled
and relocated into new forms of life around the Earth, “The substance of our
species comprises the atoms and molecules of every generation of life since
the first cell on Earth and will become the compost for all future life forms.”
(Anita Gordon & David Suzuki ‘It’s a Matter of Survival’ Harper Collins
London 1991 p.237). Each individual atom of Carbon is constantly reused. When
Animals die their bodies decompose; this provides Carbon for the growth of Plants;
and, when Plants are eaten, the growth of Animals, including humans. If each
atom of Carbon in our bodies carried with it a logbook indicating its previous
history, it would be found that some people had Carbon which was once part of
the earliest forms on Earth, perhaps later it might have become part of a dinosaur,
and perhaps later still it might have lodged with Leonardo da Vinci. In the
course of time, an atom of Carbon may have floated in the atmosphere for a few
centuries before joining an Animal for a life-time, then spending time as a
Plant, then perhaps a biped, before being dissolved in the oceans and eventually
being buried beneath the Earth’s crust for a few hundred millions years. Even
more dramatically, given that every Carbon atom on Earth was created in outer
space during the inferno following the ‘big bang’, it may have travelled billions
of light years before landing on Earth, “In the words of the song “Woodstock’,
it is literally true that we are made of ‘stardust, billion year old carbon’,
and all the carbon in your body was processed inside stars not merely a billion
years ago but well over 4.5 billion years ago, before our Solar system was formed.”
(John Gribbin “In the Beginning. The Birth of the Living Universe’ Viking, London
1993 p.61). Humans are composed of Carbon which has been around almost since
the beginning of time, which has emerged from almost the centre of the universe,
and has then been used and used and used throughout the Planet’s 4 billion year
evolution.
IV: The Chain of Life.
Carbon is also part of another recycling process.
Whilst Carbon atoms are constantly being used and reused, Carbon genetic structures
are constantly undergoing transmutation into new forms of life. The genetic
structure of the earliest forms of life have been passed on to all the higher
forms of life. Each evolutionary change contains the genes of its predecessors.
There are very few forms of life which have evolved by ditching the genetic
structure of its predecessor. Whilst a chrysalis sheds its cocoon to emerge
as a butterfly, the evolution of life does not involve the shedding of its Carbon
cocoon to emerge with a completely different genetic structure. The emergence
of new life forms doesn’t occur through the shedding nor changing of genes but
by the acquisition of additional genes. Perhaps there may have been some shedding,
and some changing, of genes but given that the code of the genetic structure
of the most complex being on Earth is the equivalent to 130 volumes of the encyclopaedia
brutannica, the most important change is the acquisition of new genes, the addition
of more genes to the genetic chain of life. Once the human genetic structure
has been decoded (a horrendous exhileration) it will doubtlessly be possible
to discover the genetic chain of life on Earth which stretches back to the earliest
forms of life .. “that every individual organism has a genetic linkage, remote
though it may be, with every other individual that has ever lived or will live.”
(Preston Cloud ‘Cosmos, Earth and Man. A Short History of the Universe’ Yale
University Press New Haven 1978 p.154). It may be possible to discover redundant
genes inherited from previous species of life which have long since become extinct
- some of which humans know nothing about. In oher words, humans may know about
such creatures only through their own genetic structure. The backbone of all
life forms on Earth is made of Carbon and the chain of life on Earth is made
of Carbon.
Micro-organisms, Plants and Animals created the
Earth’s habitability. Although in a number of senses the diversity of life on
Earth is just one of Carbon’s afterthoughts this should not be taken to mean
that diversification is a deterministic process entailing the mere unfolding
of Carbon’s atomic structure. Life also plays a part in shaping itself.
In the twentieth century it has become common sense that evolution
is the key to understanding the Earth’s life processes - and who can doubt that
chance genetic variations and the survival of the fittest are two self evident
facts. But if the significance of evolution is diminished by the role played
by Carbon’s atomic and molecular structure, it is further diminished by the
role played by Animals in maintaining climatic stability. As Lovelock argues
life creates the climate suitable for its own survival. It is the diversity
of life which maintains climate stability and as long as diversity persists
then the climate can continually be stabilized. Evolution plays an important
role in promoting diversity (through genetic variations and the survival of
the fittest) but it is the climate which determines the survival of most species.
The climate plays a bigger role in life than the survival of the fittest. Evolution
says nothing about the Earth’s climate and nothing about the way that life regulates
the climate. Whilst evolution leads to the eradication of all species but one,
the climate necessitates the survival of biodiversity. The survival of the fittest
is therefore a threat to climatic stability since it supposes that one species
will eventually exterminate all other species, dominate the Earth and thus unsettle
the Earth’s climate. The two main mechanisms of evolution are just tools of
life, evolution is not the driving force behind life.
Lovelock’s computer based thought experiment, Daisy world,
shows how two sets of daisies, one white and the other black, influence the
climate. This thought-experiment shows how biodiversity controls the climate;
how the climate creates the conditions which influences the growth of each of
these species; and how evolution plays a secondary role to climate stabilization.
Assume that the number of black daisies predominates. This boosts global temperatures
which, on the one hand, deters further increases in the number of black daisies
whilst, on the other, boosts the number of white daisies. As the number of white
daisies increases, overtaking the number of black daisies, global temperatures
begin to fall. The effect of the fall in temperature is, on the one hand, to
reduce the number of white daisies and, on the other, to increase the number
of black daisies. In effect, life controls the climate preventing it from getting
too hot or too cold. And it regulates the climate even at the lowest level of
biodiversity. As long as there is biodiversity the climate can be prevented
from going off into extremes of either hot or cold.
This thought-experiment reveals that it is not evolution which
is at work here - and certainly not the survival of the fittest. Evolution is
important in initiating biodiversity but once achieved it is the climate which
determines the relative proportion between the species and the survival of each
species. Life uses evolution to create the Biodiversity needed to ensure climatic
stability. The theory of the survival of the fittest suggests that species creates
the conditions for their own survival whilst the theory of life regulating the
climate, as could be seen from the Daisy world experiment, suggests that species
which become more and more dominant undermine the conditions for their own survival.
The greater the predominance of a particular species (i.e. the more successful
a species in the fight for survival) the more it does, climatically, to promote
other forms of life and demote its own domination. Whilst the hypothesis of
the survival of the fittest is clearly not relevant what is involved here is
not altruism as if species were deliberately promoting the survival of other
species at their own expense. The climate balances out the species because it
is compelled to do so by the diversity of life itself. Life, which is continually
diversifying, creates climatic stability and climatic stability helps to foster
Biodiversity.
Animals created humans. The phrase used earlier,
the ‘chain of life’, is intended to emphasize the linkages which exist between
humans and Animals. Humans cannot break these links even if they exterminate
all Animals on Earth since they contain the chains of the past in their own
genetic structure. But if they do destroy all other species they will undermine
climatic stability and their own survival.
Wildlife have stabilized the Planet’s climate and
have helped to protect the Earth’s life support system, “Life changed the Precambrian
environment as much as any physical process did, and we are living off the benefits
provided by our cyano bacterial ancestors 2 billion years ago.” (John Gribbin
“In the Beginning. The Birth of the Living Universe’ Viking, London 1993 p.97).
Even today, Wildlife continue to play an essential part in protecting and maintaining
the Planet’s life support system. Although no Animal species is indispensable,
including humans, it is impossible for humans to take over all the ecological
roles played by Wildlife.
The Earth’s geophysiology is indivisible. The Earth’s
climate is a unitary entity, “the atmosphere is a single coherent system, and
to understand the weather in any one place you have to take the whole world
into account.” (Nigel Calder ‘Spaceship Earth’ Viking, London 1991 p.18).
There are three types of Earthly beings; the producers
(i.e. the Photosynthesizers); the consumers (Animals which consume the products
of Photosynthesis); and the decomposers (Micro-organisms and Animals which break
down nutrients so that they can be used in Photosynthesis).
Every Creature on Earth affects the Planet’s geophysiology
and anything that happens to the Planet’s life support system affects every
Creature.
The Earth’s life support system consists of a number
of interlocking, over-lapping, planet-wide, cyclical and spiral processes[5].
I: The Carbon Spiral.
The most important of all Planetary
geophysiological processes is the global Carbon spiral, “This most ubiquitous
and massive of biogeochemical cycles (carbon) has countless subcycles turning
at vastly different rates through the ages.” (Stephen H Schneider 'Introduction
in Stephen H Schneider & Penelope J Boston 'Scientists on Gaia' The MIT
Press Cambridge Massachusetts 1991. p.xix).
The Carbon spiral consists of a number of different
spirals.
A: Photosynthesis/Exhalation Spiral.
One of the most important of the global Carbon spirals
is the Photosynthetic/exhalation spiral. Photosynthesis is carried out by Plants;
Plants are eaten by Animals which expel Carbon back into the atmosphere where
it is extracted again by Plants through Photosynthesis.
B: Volcanoes/Weathering Spiral.
The most important global Carbon spiral is the volcanoes/rock
weathering spiral. Volcanoes spew out huge quantities of Carbon. Some of this
Carbon is dissolved in rainwater which falls onto the land as Carbonic acid
which slowly ‘weathers’ (dissolves) rocks. This material is washed into the
oceans where it is taken up by marine Micro-organisms and deposited on the ocean
floors when these creatures die. Some ocean floors are pushed beneath the Earth’s
crust by the movement of the Earth’s tectonic plates. The Carbon pushed into
the Earth’s magma eventually emerges again when it is ejected through volcanoes,
“The abundance of CO2 in the air depends on the balance between the amount being
injected from beneath the crust through volcanoes and the amount lost from the
air by chemical reaction at the Earth’s surface.” (James Lovelock ‘Gaia. The
Practical Science of Planetary Medicine’ Gaia Books Ltd, London 1991 p.134).
As will be noted later, life itself is involved in hastening this cycling process.
II: The Hydrogen Cycle.
III: The Oxygen Cycle.
IV: The Nitrogen Cycle.
V: The Water Cycle.
The water cycle is perhaps the best known of the
Earth’s cyclical processes. The sun evaporates water from the oceans, clouds
deposit the rain over the land, and the land channels the water back out into
the oceans. The water cycle is broken up by Photosynthesis when water molecules
are broken up into oxygen and Carbohydrates but this is one of the few times
the water cycle deviates from its cyclical course.
VI: The Nutrient Cycle.
The nutrient cycle can be included as part of the carbon spiral
but as it also consists of a number of other elements it is treated separately.
Plants need nutrients to grow; Plants are eaten by Animals who deposit Manure
on the Earth, and this is digested by decomposers to provide nutrients for Plant
growth.
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