May 1960 — VOL. 41, No. 4 —
The Relationship of
Man and Nature
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To subdue nature, to bend its forces
to our will, has been the acknowledged purpose of mankind
since human life began, but the time has come for a revision
of our conception of the benefits and responsibilities of
holding dominion over all other created things. A new spirit
is abroad as scientists and laymen realize that man and the
rest of nature are united and indivisible.
At a time when great elemental forces are clamouring at
the bars of our civilization we need to discard our ideas
of "attacking" the forest, "bringing under subjection" the
mighty rivers, "conquering" the mountains, and "subduing"
the prairie. Instead, we need to make the most of all nature
as an ally.
Mankind is welcome to dominate the other forms of life,
provided he can maintain order among the relentless energies
whose balanced operation he has disturbed. This is a hard
condition. Our past is full of sombre warnings of what happens
when we fail to meet it. The evidence is in the remnants of
great civilizations buried beneath mud and sand.
Only when we recognize that the study of all living things
is a profoundly necessary part of human thought do we reach
the" moment of truth. Then we realize that we are part of
a complex stretching back to the beginning of time and reaching
out on every hand to the boundaries of the universe. Every
one of us is an actor in a great drama in which each plays
his part as both cause and effect.
The forces set in motion by every act of every animal and
bacterium, by every inch added to the growth of plant or tree,
affect the lives of other creatures. The principles which
govern these interrelationships are embraced in the science
called ecology, a word coming from the Greek for "home" or
"estate". Ecology is the study of how the household of nature
is kept in order.
This Monthly Letter has to do with renewable resources,
the essentials of life. Our primitive ancestors made their
way for millions of years before they discovered how to use
iron, copper, coal, oil and gold. But never has man been able
to get along without food and water. This is why the relationship
of all living things has urgent meaning for us.
The state of affairs today
In a subject so old, so vast, and so continually new, it
seems to be impossible to keep science and social life apart.
In fact, we should not try to do so. Continuance of our human
society depends upon our ability to heed the science of the
rest of nature, and live within its bounds.
There are at least three good reasons for surveying the
present state of affairs and learning about our natural environment:
(1) our advancing technology uses up resources in increasing
quantity; (2) our increasing population puts annually greater
pressure upon our living space; (3) our continued existence
depends upon our keeping our natural environment productive
of the essentials of life.
Over and above the slow changes by natural causes such as
climate, the earth has suffered measureless destruction of
animals and plants by the uncalculating actions of both savage
and civilized men.
It was destruction of their environment that caused salmon
to disappear from Lake Ontario, and the bison to die off our
Western plains, and the passenger pigeon to vanish from North
America. Forests have been burnt up, soil has been washed
away, deserts have been produced, and rivers have been polluted.
"We have," said Professor A. F. Coventry to the Toronto Field
Naturalists' Club, "for a long time been breaking the little
laws, and the big laws are beginning to catch up with us."
The balance of nature
Nature has its laws designed to maintain balance. If the
number of any living species tends to increase out of proportion,
some force will arise to control it. There is an equilibrium
in undisturbed nature between food and feeder, hunter and
prey, so that the resources of the earth are never idle. Some
animals or plains may seem to dominate the rest, but they
do so only so long as the general balance exists.
These laws cannot be disregarded without disaster. Nature
- which is our word for the total of the conditions and principles
which influence the existence of living things - will not
accept ignorance of her laws as an excuse for breaking them.
Nature's law does not command us to do, or to refrain from
doing, anything. It merely states that if a living being does
so—and—so, then the result will be such—and—such.
If we wish to avoid disability, pain and dissolution, we must
pay attention to the warning.
Every balance requires checks. Living things are dynamic,
always trying to expand. When population grows in an area
so as to menace the food supply, predators move in; when their
prey is reduced, the predators are driven to other areas in
search of food.
Before shying away from the "cruelty" of nature, let us
look at the necessity which prompts it. Let us suppose there
were no control over soil bacteria, the smallest and simplest
of all living things. Then, says John H. Storer in his delightful
book on ecology The Web of Life, under favourable conditions
each individual would divide into two about twice every hour.
Even if it happened only once in an hour, the offspring from
a single individual would number 17 million in a day, and
by the end of six days the cells would have increased to a
bulk larger than the earth. Or consider the oyster, which
may discharge 500 million ripe eggs in one spawning. If all
these matured and all subsequent progeny survived, after only
four generations there would be a pile of oysters eight times
the size of the earth. The balance preserved by nature prevents
calamities of this sort.
About soil and water
Good soil is a living thing, and its health is a matter
of life and death to plants and animals. What folly it is
to call silver, gold and gems "precious" and dirt "base".
If there were as great a scarcity of soil as there is of jewels
and precious metals, we should gladly give a heap of diamonds
to purchase only so much earth as would hold a small violet
in a tiny pot.
The soil is constantly changing. In the soil we find one
of the oldest laws of life known to us: birth, growth, death,
decay and rebirth.
Nothing is wasted in nature. Everything nourishes something
else until the bacteria finally get hold of it and return
it to the soil after breaking it down once more into inorganic
compounds which plants can again transform into protein. The
roots of man's physical and mental health spring from the
soil.
Soil is first of all rock particles, then the organic matter
from dead plants and animals, and finally a community of living
plant and animal organisms. Roots, insects, worms and bacteria
build fertility into it, while small mammals plow it and let
in the air. The soil becomes filled with organic matter containing
packaged energy from the sun.
The hive of living things existing in and on the soil is
vitally important. At Rothamsted in England, the oldest agricultural
research station in the world, it has been found that the
population of invertebrate fauna per acre of fertilized land
is fifteen million, of which eight million are insects.
Water is essential to soil development, as it is, indeed,
to all living things.
Movement is of the essence of water, and the most damaging
impact of civilized man on his environment is the shattering
of this cycle of movement. The break is caused by the destruction
of plant cover, removing the sponge—like texture of the
complex topsoil - topsoil which, it is estimated, took five
hundred years per inch to build.
Breaking the water cycle has wiped out civilizations in
Mesopotamia and North Africa and elsewhere, but because of
soaring world population we have reached a new crisis. "Never
before," says William Vogt in his soul—searching book
Road to Survival, "has the hydrologic cycle been badly
dislocated in the presence of so many hundreds of millions
of people."
Waste of water, including unnecessary run—off, or excessive
use from any one place for industrial and domestic purposes,
or for irrigation, can lower the underground water table,
sometimes far away, and deplete or temporarily exhaust the
supply.
The primary means of increasing and maintaining water reserves
is to protect and improve the plant cover on our watersheds.
From these areas of drainage the water is fed by run—off
and seepage to surface and underground streams.
The watershed problem is one of the red—letter problems
of the day. Almost everything that has to do with renewable
natural resources, with forestry, farming, hunting, fishing,
and the economics of production, is tied up with the watershed.
Plants and trees
It is quite correct to say that all flesh is grass. Animals
lack the ability to subsist on the simple elements in air,
water, sunshine and soil. To perpetuate themselves, they must
eat grass or one another. The plant can turn inorganic chemicals
into living tissue.
No one can. deny, then, the importance of plant life to
continuance of the human race. Without that silent, endless
manufacturing process which goes on in the green leaf under
the influence of chlorophyll, sunshine, air, and moisture
- the world's primal industry - we should surely die.
Every spring, nature's factory starts again to produce food,
harnessing the sun's energy and combining it with elements
from air, water and rock, into living tissue. From the roots,
through the fibres, the sap runs up, carrying water and nourishment
to every part of the plant, and in the inside part of the
bark it flows down, bringing the foodstuffs which the leaves
have manufactured.
Forests are living societies of trees, shrubs and other
forms of plant cover. Although more than forty per cent of
Canada's surface is covered by trees, our people are becoming
conscious of the need to conserve and expand our forest resources.
Most industrial countries pass through the same three stages
of forest history. The first is marked by energetic and often
ruthless exploitation of virgin forests. This is generally
followed by a period of increasing dependence on foreign supplies.
Then the third chapter begins: the effort to rehabilitate
or partially restore the domestic forest resources.
Violation of the laws governing the extent of necessary
forest cover is one of the most tragic examples of human folly
in the face of nature's well—ordered system. But it does
us no good to place all the blame upon the pioneers. They
did the thing that seemed right to them under their circumstances.
If they denuded our watersheds with axe and fire, if they
used the hoe and the plough where only trees could grow, they
paid the price in their own lives through blasted hopes and
abandoned farms and niggardly living. It is our part, knowing
more of the interrelationships of all nature, to repair the
damage where we can, and to make sure that such things do
not occur again.
Importance of environment
What is environment, in the sense of "natural environment"?
It includes all factors, natural and artificial, which affect
the development of living things.
Life is correspondence with environment. Different creatures
seek different environments, but everything exists at a specific
place under specific circumstances. As human beings, our greatest
psychological asset is a sense of confidence in our environment.
The carrying capacity, which is the measure of the amount
of life any area of land or water will support under given
circumstances, may be altered from time to time by changes
in conditions caused by nature or by man's use of the area.
It sometimes happens that these changes lead to a precarious
existence. The creatures in the area may seem to be leading
a static life, but our environment is not a museum display
case in which petrified groups are forever removed from contact
with nature. Something is always happening, and just a little
change, a little more severity, a little more depletion, may
bring to an end the existence of groups or all the population.
No one knows how many species during the ages failed to
meet the challenge of their environment. George L. Clarke,
of Harvard University and Woods Hole Oceanographic Institution,
says in his textbook Elements of Ecology that about
21,000 species of extinct vertebrates and an even larger number
of extinct higher plants have been described.
Today it is necessary for mankind to adjust its usage and
to manage earth's remaining resources more creatively if it
is to survive. We see the warning in the life history of every
forest. Trees such as oaks grow so big that their own seedlings
cannot survive in their shade; the oak forest perishes, and
is replaced by shade—tolerant trees like the beech, the
maple and the hemlock. Then, as long as the present climate
continues, this will remain a beech, maple or hemlock forest
- a climax forest - because these trees have the ability to
reproduce under their own shade.
Effects of human acts
It is a curious commentary on our sense of values that though
we think of mankind as being the highest form of life the
other forms of life almost invariably go into decline wherever
we take possession of a piece of the earth.
Civilized man has been more ruthlessly wasteful in his attitude
toward the natural world than has served his material interests.
The practical utility of land, water and forest has been diminished
seriously by our determination to allow them to serve no purposes
but our own. This exploitation led Maurice Maeterlinck, the
Belgian dramatist and writer, to say: "Everything seems to
foretell that man, the last comer to this earth, will be the
first to leave it."
Through the use of his intellect, man has to some extent
escaped from the controls of nature. He has meddled with small
parts of a machine of whose total design and purpose he was
ignorant. He now faces the hard task of encouraging natural
forces to work in restoration of the damage he has done.
Because of the danger attending ignorance, we need much
more information about nature than we have yet gathered. Even
well—meant efforts may bring disaster, as witness the
experience with deer at Kaibab Forest, on the north rim of
Grand Canyon. When, in an effort to increase the population
of deer, the authorities killed off great numbers of mountain
lions, coyotes, wolves and other predators, the deer population
increased from 4,000 to 100,000 in fourteen years. The land
did not have the carrying capacity for that huge number, and
consumption of all the food was followed, in two years, by
a sixty per cent reduction in the herd through starvation.
Hunting and fishing, formerly practised for the food they
yielded, are valued today chiefly for their recreational use.
Once in a while we encounter something that is very far from
sport, and we see the wilderness in its sourest mood. It is
the rampage of a killer who wastes wildlife for what he calls
a bag. He gets no satisfaction except that of saying "Something
which wanted to live is dead."
The true sportsman knows the spirit of the outdoor world.
He follows the rules of the game. He believes in and obeys
laws which protect wildlife.
One of the most repulsive of the destructive results of
human expansion is the poisoning of rivers, with consequent
extinction of fish and of well—nigh every living thing
except mould and putrefactive bacteria.
The fisheries of the lakes, ponds and streams are among
our most important recreational resources. But our rivers
are choked with the refuse of civilization. Our lakes are
poisoned by industrial and sewage pollution. The water is
dangerous to drink and risky to swim in; the plants are killed
which should help to purify the water. Here and there across
the continent municipalities are trying to stop the process
of pollution. Several shipping companies have been prosecuted
for dumping oil in our inland waterways, and a 50—mile
zone off Newfoundland's east coast has been declared a region
in which oil may not be dumped.
And now we are exercised about nuclear fallout. Its effect
upon living things is a matter of debate, but there seems
to be reason to believe that fallout will be like another
influence superimposed upon all natural things.
It is because of growing awareness of the vital need for
knowledge and action that the first national Canadian conference
on conservation is to be held next year. Its title is "Resources
for Tomorrow."
How is one to learn?
It is a great loss to travel the countryside and not see
it, since contact with nature is a vital part of man's enjoyment
of life.
Facts about nature may be read in books (like The Ladder
of Life by A. Gowans Whyte and The Great Chain of Life
by Joseph Wood Krutch, both introductory books) and seen
on television (as in Dr. Ian McTaggart Cowan's Web of Life,
the Sunday CBC programme from Vancouver.) But after sampling
in this way we will want to go into the woods and sit down.
The centuries of dead leaves that have fluttered to the
ground have provided a rich layer of mould, soft as any carpet,
with an embroidery of wild flowers to make it beautiful. The
drama being played among the trees is without end. In the
tree tops the robins are singing their absurd but delicious
little four—noted songs; saucy squirrels are gamboling
in the branches; ants are scurrying among last year's leaves
on their mysterious errands.
These children of nature are all straightforward creatures
with very simple intentions, and every one is supplied with
beauties of one kind or another. Watching them, we realize
that the mystery of life is not a problem to be solved, but
a reality to be experienced and preserved.
Biologists are aware of the need to preserve nature's balance,
and of the techniques, but only public opinion nurtured amid
such scenes can make the application of these procedures effective.
There is no automatic force in nature which will carry human
beings forward irrespective of their own efforts. We need
a new creed to be stubbornly faithful to the facts of life;
and a new determination - to contribute our effort in doing
the right things.
Our hope is in education. The problem is not as simple as
two plus two, quickly answered and as readily disposed of.
This is a problem for statesmanlike people who take a long
view, who look not at the next vacation or the next balance
sheet or the next election, but at the future of mankind.
Since the beginning, the world has presented challenges
to living creatures: to crawl out of the sea to live on dry
land, to climb trees and mountains, to change in keeping with
changing environment. Every creature is to itself the centre
of its own universe, but it must have contact with all surrounding
creatures. The challenge to us is nothing less than preservation
of our species by restoring and maintaining its essential
environment.
We are surrounded by, and we are part of, the eternal flux
of life in an environment of natural forces. An Eastern proverb
puts it: "To survive, all men must hold hands." And living
things of all sorts are our kin in the wholeness of nature.
If we wish to preserve our present way of life we must come
to terms with what is left of natural forest, soil, water
and wildlife, and it will be on terms laid down by nature,
not imposed by us. Any wrong which nature may for centuries
commit, she has centuries to repair, but we, whose days are
short, must walk warily lest we become the victims of the
wasteland we make.
Published by RBC Financial Group. All editions from the RBC
Letter collection are available on our web site at www.rbc.com/responsibility/letter.
Our e-mail address is: rbcletter@rbc.com.
Publié aussi en francais.
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