I think that when most folks say natural, they don’t mean that it arises out of nature, because, if that were the case, then everything is natural. Humans come from the nature of our world, and everything we do is natural.
I think what most people mean by “natural” is the most basic form of a thing, before it has changed anything else. Even here, “natural” is a kind of fetishistic myth. There is no such thing a a living thing that is currently in it’s most basic form, evolutionarily speaking. Change is constant, and so nothing is natural by that definition.
People fetishize the natural state of things to imply that, before humans came along, everything was perfect. If we could only undo the human impact, everything would be balanced and perfect.
Of course, if you ask how far back we have to undo the impact of humans within our environment, it is impossible to answer, at least, without displaying some prejudice or another. And then, what about all the other “natural” beings that changed the environment? Do we have to undo their impact, too?
No, I think “natural” is pretty much a useless concept. It’s impossible to define. It means whatever the person employing it thinks it means. It is used to hide various agendae. Not deliberatly hide, but just lazy thinking hiding.
The issue, for me, is what do we have to do to survive, as humans, in the future. Global warming? Well, it’s happening, and who knows where it will stop, and who knows how it will impact humanity. I think that it will cause serious migrations of humanity, but these will happen slowly, and we’ll be able to manage them.
Even if we screw up the gulf stream, stopping it and whatnot, we’ll still survive. We might start another ice age, but we’ll still survive. We are very mobile and very inventive, and that will not change.
So why would I fight global warming? Because it will cause us serious dislocations, and will hurt a lot of people. I’d like to head that off, if possible, and if not, at least diminish it’s impact as much as we can.
We can take on the physician’s dictum: “first, do no harm.” Our problem is that we cannot predict the impact we will have on the environment. We don’t know what problems we’ll create for ourselves. We want to minimize problems, so some people say we should advance as slowly as possible, checking very carefully to make sure there are no terrible side-effects to what we are doing. These are “environmentally friendly” folk.
Others say, we have to charge forward, as we always have, leaving waste behind us, for that is the best way to survive. We must invent and travel, and we can’t afford to be good stewards, for we will lose that way.
This is an ancient battle amongst humans. Both points of view have advantages and disadvantages. I believe that if people are honest, they won’t be able to say which is better, because we can not predict the future! I, myself, straddle both camps, if you can believe that.