Evolving in Place

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ImprobablePrimateEnvy is not a word I would use to describe how I feel about those trying to piece together the earliest stages of humanity. Evolution, naturally, is a given. Once beyond that, however, the landscape gets dicey. Clive Finlayson is an author I don’t envy. I just finished his The Improbable Primate: How Water Shaped Human Evolution, and it felt like he had to put this immense puzzle together while missing about nine-tenths of the pieces. Early human fossils are rare and it doesn’t take much to throw a laboriously constructed scenario into yesterday’s mistaken hypothesis bin. The central premise of the book, as stated already in the subtitle—human evolution followed water—seems about as firm as any idea. We need water daily and our bodies evolved to help find it efficiently. It’s a fascinating story. Along the way I learned that much of what I’d previously learned about ancient human development was probably wrong. I’m only a casual evolutionist.

Finlayson suggests—and not all biologists would agree with him—that all humans living on earth at any one time (with one possible exception) were of the same species. That is to say, the model I grew up with of separate species (Neanderthal and Cro-Magnon were the usual suspects) duking it out over scarce resources doesn’t match growing evidence very well. We Homo sapiens seem to share some Neanderthal DNA and that paints a somewhat more romantic encounter between the species than the violent one I learned. The same goes for other human ancestors, according to this little book. Our first instinct may not be to kill the stranger. We may have lived apart for a few thousand years, but when populations come back together they “share genes,” if you get my drift. This still happens, of course. The difference is today we’ve become politicized and entitled. We don’t want people not from around here to share our stuff.

Part of that is natural, I suppose. Finlayson points out that the feeling of belonging in natal territory is something we share with other primates. We feel that we belong where we’re born. That seems to me a difficult thing to quantify, but I feel it nevertheless every time I venture back to my hometown. It just feels right. Not that we can’t adjust to elsewhere, but our nature rewards us, in some measure, when we come home. This is a wide-ranging study for such a small book. I don’t envy all the meticulous jigsaw staring without a box-top that students of human origins must do, but the results are still quite interesting. Even if the picture, when enough pieces are finally found, ends up being something different than we thought it was.

The Philosophical Neanderthal

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HumansExtinctExtinction. It’s a depression concept, but one that nevertheless constitutes a reality in evolution’s world. When applied to members of our own species we term it genocide and declare it an evil. Our perspective—not to dispute the value judgment—is hopelessly foreshortened. Our brains have evolved to promote individual survival, not to see the longue durée. How often do we worry about the extinction of Homo erectus? Or the australopithecines? Without them we wouldn’t be here, and yet, they’re gone. The case of the Neanderthals is perhaps closer to home. We now know that Homo sapiens overlapped with Neanderthals. Some of the questions raised by Neanderthal extinction are given serious consideration by Clive Finlayson in his study, The Humans Who Went Extinct: Why Neanderthals Died out and We Survived. To get a sense of how this works out, and how it applies with our current contribution to global warming, we must be prepared to view the extreme longue durée. Duration beyond comprehension.

One thing that becomes clear from the very beginning here is that climate has driven evolution perhaps more than we often think. Species, which tend not to live through the relatively long reach of climate change timescales, adapt to the circumstances of their environment. They either do, or they go extinct. Climate, however, is a balancing act teetering toward equilibrium. Hot and cold, evening each other out. Over an even longer duration, our sun will run out of metaphorical steam and things will get quite a bit chillier out there. For the meantime, however, shifts between ice ages and periods of warming will continue to seesaw across time and our race, among many, will need to adjust to survive. Perhaps acknowledging our own role in the current global warming might be a way to start. Our species tends to be short-sighted.

There is an irony here. History and prehistory have shown that, as Finlayson points out, that those best equipped to survive radical changes are the poor. Extinctions—some of them quite dramatic—have occurred before. They will surely come again. When times get tough, it seems, the comfortable get going. Going extinct, that is. Those who climb the corporate ladder the highest have the longest distance to fall when things go bad. The poor, who have to struggle every day to survive, are the ones who know how to get along in circumstances that turn sour. I have called this an irony for what might seem obvious reasons. There is another as well; here we have science pointing again in the direction of the Bible. There it was noted long ago that the meek would inherit the earth. And that’s a bit, it seems, that should be taken literally.