Like I said in my last post, the
paleontologists came to the same conclusion the biologists did: it is
essential that we care about biodiversity, and doing so requires a
moral discussion on the order of ending slavery, declaring free
speech, or striving for gender equality. All things that aren't really in their
field! But they are in the field of moral philosophy, which is what I
read next.
The moral philosophers
I read sounded a lot like the environmentalists, except they hadn't
concluded anything yet. They lamented humanity's lost connection to
nature, but said the role of philosophy is in getting people to
choose how much culture and nature they want, based on what science
and economics tell them will happen. The thing is, science tells us
environmental degradation, left unchecked, will ruin all of the
cultural advancements we've made. Political theory says that in
crowded environments where resources must be tightly controlled,
democracy is unlikely: submarines, spaceships and the like are all
military dictatorships. So we need to take this into account. But it
seems like ethicists are more around to help people figure out what
they want than to tell them what they should do. Which makes sense,
but it's somewhat disappointing; one discomfiting thing about growing
from a child to an adult is becoming your own moral authority, then
realizing all our rules were just made up by other adults.
Ethical dilemmas in
environmentalism are still possible, like when an elk was stuck in a
tar pit in a US national park, and calling out for help before it was
ripped to pieces by wolves. The consensus seems to be that humans
should alleviate as much suffering that they are responsible for as
possible, while respecting the wildness of animals. But what if the
elk is from a locally threatened population, reduced by hunting,
pushed to this dangerous habitat by encroaching settlement? What
about the wolf's right to eat? He may be endangered as well. Merely
extending human ethics to wild animals belittles or sabotages the
harsh Darwinian realities of wild life, but the suffering that humans
cause other animals is complicated and requires consensus built
through discussion and moral prioritizing.
How do we make these
decisions, though? It has to do with how we see ourselves as a
species. I read some more philosophy that dealt with humans
specifically, asking questions about whether or not we're special and
if so, what we should do about it. From a certain perspective, we
have escaped the Darwinian trap. Changes in our own behaviour are
dictated by cultural, not biological evolution. We have
self-reflective capacities we have yet to ascribe to any other
species. And we have the power to affect the planet to an extent not
shared by any other macro-organism.
Philosophers of human
life generally agree that we have the choice not to follow natural
selection in the same way that an amoeba does. We can choose to
self-impose limits on the effect we have on the planet. If
overpopulation would have disastrous socio-political consequences,
it's in our best interests to do so. The most optimistic of them said
that we are the only species that can prolong the Earth's window for
supporting life, beyond what would naturally occur, because our
science can help us engineer the climate. So we have the capacity to
be the most positive species on the planet!
Offsetting this
optimism was a strange and fascinating argument from astrophysicist
J. Richard Gott. He attempted to determine whether humans would
continue to increase in number and sophistication; whether we were a
true exception. Dealing as astrophysicists do in competing
theoretical explanations where scientific tests are impossible, all
he could conclude was whether or not we should believe that we are
exceptions, whether it was likely or not. He found that it was very
unlikely, given the current population explosion, that it would
continue. He made it clear that he didn't think humans would
necessarily go extinct soon, but that they were unlikely to keep
increasing.
The way he did this
was argue that if the life we are living was picked at random from
all of the human lives that have happened and will happen in the
future, ours is most likely to be chronologically somewhere in the
middle. Assuming we were thrown into one of the lives, it would be
unlikely to be one of the first 5% of human lives, or one of the last
5%. And yet humans have existed in relatively modest numbers until
the last few hundred years. So Gott argues that we should be
sceptical of any potential future that imagines the population will
continue to grow or even stay this high for a long period of time,
since a significant percentage (10%?) of the human lives ever
estimated to have existed are being lived right now.
This
is a weird type of argument I was not familiar with, and one that
seems likely to be wrong at first glance. After all, you could have
made the same argument at any point in human history, and with
hindsight you'd always be wrong. But it isn't claiming to predict
anything, it's just saying that we shouldn't base our decisions on
the theoretically unlikely event that the human population will
continue to increase or stay at current levels for a long time. That
conclusion actually seems pretty reasonable, despite the fact that
humans continue to seem like an exception. We may well be, but we
seem to be approaching the carrying capacity of an increasingly
fragile Earth. And we are not yet close to colonizing other worlds,
so this is a hard limit (technology-dependent) for now.
So
far I'd seen environmentalists, biologists, paleontologists, and
philosophers weigh on the problem of the loss of biodiversity. One
thing they all had in common was they recommend immediate action, and
the second thing they had in common was passing the buck of actually
enacting the necessary change to the political and economic spheres.
So I knew I needed to learn more about that; not only what we need to
change, but the ways the current system makes change difficult.