Diversity needs space
In 2010 biological diversity is emerging from the long shadow of climate change. In an interview with ETH Life, ETH professor Paul Schmid-Hempel explains why the UN International Year of Biodiversity is urgently needed.
Every day we hear bad news about climate change. Now
the Year of Biodiversity is upon us bringing with it similar bad tidings. Are
we heading for a collapse as far as biological diversity is concerned too?
Expressions such as collapse or disaster must be used with caution. We do,
however, have a substantial - man-made - reduction in biodiversity. However, we
should neither simply bury our heads in the sand nor deny the loss of biodiversity.
The world will change, and some of the change will not always be to our
advantage. What constitutes a disaster depends on one's moral concepts.
What are the main causes of the loss of biological
variety?
The main cause is land use. Man is using the land more intensively now than
was the case 100 or 200 years ago. Man has been using land since the dawn of
time. For example, the Romans cleared forests on a large scale in North Africa to build ships with - with devastating
consequences at the time. As the population has grown and individual
requirements have increased, the loss of biodiversity has accelerated. In broad
terms: agriculture instead of rain forests. Under excessive use, oceans suffer
beyond the capacity of their ecological systems to provide. Climate change will
add a further factor.
Why is this?
Climate change has two consequences: Agricultural areas, which were once
productive, are no longer so because of climate change. New, previously untouched
surfaces come under the plough. A more direct consequence is that the
environmental conditions change for the species. Thus there are movements. The
problem is whether species also have the ability to change. Theoretically, it
is possible, but in practice only happens if the populations are large enough.
However, we have always had certain species becoming
extinct.
Today the speed and dimensions are completely different. New species are
indeed being discovered all the time. These, however, only constitute a
fraction of those already in existence and which are being lost. Becoming
extinct "naturally" is not an argument.
Biodiversity only matters to interested laymen or
specialists; the average man in the street can probably name 10 different types
of bird at the very most. What needs to be done to make biodiversity become
something of importance?
What personal and cultural values are obtained from biodiversity depends
on the individual. It is obvious that the man in the street does not necessarily
know all the different types of tree. The litmus test is what people do in
their spare time. Obviously nobody goes where nature is dead. No one spends
their holiday on a motorway junction, but goes somewhere he can bathe,
somewhere of natural beauty. It is the same with biodiversity. Natural variety
is considered to be more refreshing than a monotonous or barren landscape.
Of course, it doesn't only affect holidays and leisure
time. What other impact does biodiversity have on us?
Functioning ecological systems provide us with things like healthy air,
clean water and “technical solutions”, like the stabilisation of mountain slopes.
A varied ecological system is more stable than one which is species-poor in all
respects. To this must be added the natural pharmacy. There are active
substances from plants which we still do not even know about.
Do you have any examples?
Natural substances constitute 80 to 90 per cent of our pharmacy. A certain
Periwinkle from Madagascar,
a threatened species, produces a strong cytostatic drug and is a potent agent
against certain types of cancer. There are also technical applications and interesting
materials. Thus researchers are trying to find out how barnacles cling so
strongly and what their adhesive consists of, so that it can be made
artificially. In nature, diversity has been supported by millions of years of
trial and error. It would be absurd to discard these resources before we can
profit from them. The ETH would do well to devote more attention to the
resources of biodiversity.
But what use is it to the material specialist, if
he knows neither the name of a plant nor what it demands of its environment?
One cannot just take the plants which one knows to produce an active
substance. One should know where they live, what they need to thrive and how they
can be obtained. In addition, bioecological research is required, as well as a taxonomic
and systematic foundation. It is precisely in these latter fields that the ETH,
not alone among the universities, has not excelled in recent years. Geobotanics
is certainly still well represented but in the field of animal diversity there
is almost nothing here other than the insect collection. Some praise should be
given to Eawag, the Swiss Federal Institute of Aquatic Science and Technology, in
relation to life under water.
Why did the ETH almost abolish systematics, for
example? Is it not prestigious enough?
It is a question of priorities. It should be understood that the ETH is more
than a university. On a long-term basis, however, the ETH must have an interest
in investigating biodiversity because many areas are affected by its loss, for
instance, biology and the environmental sciences, which should be the flagships
of the ETH. Environmental research is not only about air pollution control and
refuse disposal, but also the preservation of biological diversity. It would only
be very short term if the ETH were to only pick fields such as system biology. It
would be useful to society, but in the long run not very meaningful, if nature were
to become impoverished as a result and we could no longer understand how nature
functions beyond the cell.
But one knows all the proteins in cells and can possibly
find active substances against diseases.
There is naturally some justification for this and this research has also
been successful to an extent, but it is a matter of balancing long-term
interests. The ETH should also become more concerned with questions of biodiversity.
These are every bit as important as questions regarding climate change.
Do we have to glue a price tag to each tree, so
that a value can be assigned to biodiversity?
As a scientist and a human being I certainly hope not, but in today's climate
I must say as a realist that this reorganisation of our society - and also of
the university - along business lines has become very important. In the long
run this is the most plausible: An intact nature has an enormous monetary
value. If it is not there, we ourselves must pay for what it provides.
What is the magnitude of what nature provides?
World-wide it probably amounts to trillions. The amount is tremendously
high, because we do not have to pay for things like water storage or keeping
water clean in forests. A mono- cultural forest cannot perform in the same way.
In addition, even the pollination of our crops is an important topic. A lake or
a sea cannot survive with only one species. It needs a food chain. Only in this
way can one get fish. It is a law of nature: diversity is needed, just so that
we can live well.
How can politicians be persuaded that the maintenance
of biodiversity is a matter of importance?
I think that awareness is widespread but action is also required. It is
actually an economic argument. In the long run it is better to let nature offer
her services. It is more advantageous than having to accomplish everything
technologically. This advantage is only possible if nature is diverse.
Are protected areas in the long run the only effective
means of achieving diversity?
Protected areas are an important cornerstone. Nature needs to be screened
from the influence of man. In addition, clarification and education are also
needed, even if their effects are not as great as one might hope. People’s personal
experience is also important and can be gained in facilities such as the
Sihlwald Nature Centre. The authority and reliability of the universities
within this field are important in discussion with the public and in politics. The
ETH should also throw its weight more behind biodiversity.
But protected areas are not created through
academic discussions.
Nature needs space. Therefore nature reserves are important. I am aware
that one cannot do this against the will of the population but we are all in
the same boat. One of the best things which nature protection organizations can
do is to buy land. The founder of North Face, Douglas Tompkins, buys enormous acreages
in Chile and Argentina which
he leaves to nature. That is one of the most effective ways to preserve diversity.
I therefore wish that more wealthy people would also invest money with us in
such enterprises. It is important to me though that no antagonism to man will
arise from it.
The world population grows, the fruitful lands
shrink. What are the chances that sufficient land can be put aside for diversity?
Unfortunately, the chances are not overwhelming. Countries such as China, India
and Saudi Arabia are now buying
up large agricultural areas in Africa in order
to be able to feed their future populations. These countries have lots of
foreign currency. In addition, it is unlikely to be possible to increase the
unit yields significantly either with current or future technology - thus we
are in the midst of a geopolitical conflict over land and square metres. That
is not good for biodiversity - and you don’t need to be a scientist to be able
to see this.
- 05.04.10: Biodiversität: Gentechnik zerstört Genpool
- 07.01.10: Biodiversity: United World
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