JimC wrote:Seth wrote:
The implication is, of course, that "natural" processes (defined as uninfluenced by humans) are "better" than human-influenced processes.
"Better" isn't the point, in any sort of moral sense. However, we can measure the impact on ecosystems caused by human interference, past and present. In many ways, it is the
rate of change that is critical.
Critical to what? Critical to your anthropocentric conceits about the proper course of evolution I believe. This position presumes that one path of evolution is "better" than another, and in this case, human activities are viewed as "negative" or "worse" for evolution. It's a value judgment on humanity that has no rational basis because evolution is as evolution does, and being morally neutral, evolution is neither good nor bad, it just is.
Aboriginal Australians had a significant effect on the Australian ecology from 50 to 60 thousand years ago, but given their relatively low spread though the continent, low population numbers and technological base, the effects were absorbed at a rate with the ecosystem as a whole could adjust to (they too had an impact via an introduced species - the dingo. This semi-domesticated dog was almost certainly responsible for the disappearance of the Tasmanian Tiger and the Tasmanian Devil from the mainland)
So what? That's evolution in action. Your anthropocentric interests in the continued existence of the Tasmanian Tiger, or homo sapien sapiens are utterly irrelevant.
European man has had a much more dramatic effect over a couple of centuries, introducing a much wider range of feral animals, and accelerating the rate of extinction by a very high degree. Biodiversity is one objective measure of the health of an ecosystem, and it has plunged in many areas of Australia. Once a species is extinct, a unique facet of the world has disappeared for good. Sure, we know that extinction and speciation are natural processes through time, but when extinction rates are accelerated many fold, natural communities become impoverished in comparison to their original state, and the process can easily snowball, given the inter-locking connections in any natural community.
Do they become "impoverished?" This is nothing more than a value judgment of the status quo ante, which is, again, an anthropocentric conceit. The extinction of one, or many species does nothing more than open up ecological niches for other organisms to evolve into. It's neither good nor bad, impoverishment nor enrichment. It's just evolution, which is nothing more than a descriptor for whatever happens. Your interests in keeping "nature" in your preferred stated is an anthropocentric conceit, nothing more.
Seth, you can make as many philosophical points as you like about "natural", but that makes no difference to the reality of natural communities being weakened, in a truly objective sense, by some human activities, and makes the truly heroic efforts of various organisations to preserve endangered species something to be admired and valued. This is not a sentimental attachment - one can recognise that certain species were heading for extinction because of specialising in a disappearing ecological niche, for example, and not be too alarmed...
Again, this is an anthropocentric conceit that holds, without rational justification, that the status quo ante is "better" than whatever will emerge through evolution.
These points, by the way, are made by someone with an honours degree in ecological and evolutionary science, and a lifetime of reading about and observing the natural history of Australia... Would you care to list your qualifications in assessing ecological issues?
I'm not saying that humans don't have impacts on the ecosystem, I'm merely saying that those impacts are just exactly as "natural" as glaciation or desertification caused by planetary tilt and solar variation. Therefore, human impacts being as "natural" as any other sort of impact (like an asteroid), it's nothing more than anthropocentric conceit to make a value judgment about those impacts because it assumes that one sort of impact is "natural" and therefore "good" and one sort of impact is "human-caused" and therefore "bad."
This is not the case. Evolution is what it is, and we have already agreed that evolution is morally neutral. Therefore nothing humans do is better or worse than anything else that affects the environment.
"Seth is Grandmaster Zen Troll who trains his victims to troll themselves every time they think of him" Robert_S
"All that is required for the triumph of evil is that good men do nothing." Edmund Burke
"Those who support denying anyone the right to keep and bear arms for personal defense are fully complicit in every crime that might have been prevented had the victim been effectively armed." Seth
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