I must admit, it is challenging to read Elizabeth Kolbert‘s book The Sixth Extinction without feeling a bit of dread.

Nonetheless, the book is informative and fascinating–even funny at times–and well worth reading if you are the type who can get beyond your anthropocentric leanings and attempt to view the long-range picture from a scientific, if not exactly neutral, viewpoint. Her main argument is that we are, indeed, in the midst of a 6th mass extinction era and that human beings are “the weed” that most likely is the cause of these numerous extinctions–and not just since the industrial revolution, but eons before that. Humans travel more effectively than almost any life form, and that leads gradually to a loss of diversity. Read the book to find out how that works.

I find interesting parallels with socio-cultural trends in the ecological struggle for and against diversity. Niche-dwelling creatures or societies adapt to some challenging environment and develop or evolve ways to deal with adversity–cold temperatures, constant rain, saline soils, whatever. Nomadism, for example, is a way to adapt to seasonal weather challenges.

When an ‘alien’ enters a niche area, it usually dies off; but if it can adapt, there is hybridism or conquering. Tolerance, it turns out–living peacefully in tandem using the same resources–is not a common evolutionary strategy, though there are examples of symbiotic ecological relationships and, of course, parasitism of the sort that does not quickly kill off the host. Conquering generally means lost diversity.

When a niche organism ventures, accidentally or otherwise (forcibly, sometimes) into a new region as ‘alien,’ the special characteristics of the creature cause it to die or, in some cases, to have to adapt to a different set of circumstances…and diversity gets lost pretty quickly that way. In my region, for example, wetlands have experienced overruns of phragmites.

Does this sound like emigration? War? Forced removal of peoples? Indigenous populations killed off by measles or smallpox? Young people leaving remote areas to try to find work in cities? I see a metaphor here!

While human beings may try to celebrate diversity (which is better than using diversity to identify and exclude or punish “the other”), we probably cannot keep ourselves from becoming, over the centuries, less and less various. A homogeneous world seems, to me, to be a place impoverished through lack of niches and creative adaptation–but that’s what happens when mass extinctions take place: a depletion of kinds in the fossil record.

You might want to read Robert Sullivan’s New York Magazine article for even more recent scientific evidence if you’re not up to reading a whole book, though Kolbert is an engaging writer and I found her book to be a quick read. And below, some graphic illustrations from LiveScience. Fascinating stuff.

Here in the USA, alas, we seem to be helping the extinction of our own kind along by viewing diversity among people as dangerous. Compound this with a society that permits the ownership, hoarding, and use of deadly weapons on others and which cultivates a cultural tone of fear, anxiety, and entitlement, and there is strong evidence that the human weed will continue the slow but decided progress of the Holocene extinction.

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Source:LiveScience