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Our world is a pretty big place and conditions for tiny peeps crawling around on it, at the interface with the surface and the ever so thin atmosphere where marvelous chaotic gaseous fluid systems create the ebb and flow of our climate with interference from external sources of heat, light and other emissions, are going to be dramatic at times, but probably reasonably stable in the main. If they weren't stable for the majority of the time, once the atmosphere became largely composed of methane, nitrogen and some oxygen etc we probably wouldn't be here would we ?
Although we can appreciate data sets taken from ice cores and tree rings, I doubt we will ever be able to accurately model what the climate was like hundreds or thousands of years ago because such data sets represent only a limited slice of the whole picture. It appears hard enough for us to determine if tomorrow will bring cloud, drizzle or heavy rain to any given area smaller than say Wales.
I've read studies that purport to show humans altered the climate / atmosphere when we began adopting an agricultural, more settled, life-style in the neolithic period. And we know about the potential material just one large volcanic eruption can put into the atmosphere. So it shouldn't come as a surprise that our more recent, industrial, emissions have played some part in effecting that same immense chaotic system.
I am more concerned about the health of the worlds oceans, which, of course, play a major part in driving the atmospheric machinery. But not so much the effect they have in that system, more the effect that increased acidity therein will have on our food chain! The oceans continue to absorb vast amounts of pollutants (man-made or other), which we blissfully ignore at our peril. We could probably adapt sufficiently to survive another ice-age or, alternatively, the desertification of most of Europe, but if the oceans become lifeless foul-stenching mega-sewers, we would find that adaptation, and hence our survival, far, far harder to achieve.
Come what may, something will have to give when / if things get tougher down here on the surface, it will inevitably have it's largest effect on the weakest and those least able to adapt. I am a great adherent of a self-managed human population, by which I mean individuals taking the responsibility to keep the human population at sustainable levels, because in the greater scheme of things, it brings benefits to the whole population - that's us, all of us, together.
I suggest that through our ingenuity, technology and by taking responsibility for both population and waste / recycling etc we could do a whole lot more to not only mitigate our industrial emissions, but put ourselves in a better position to react, adapt, change and possibly survive whatever might be heading our way in terms of climate change or oceanic catastrophe.
Currently, however, this would prove to be a difficult fit with our self-imposed model of global finance, consumerism and the severe dichotomy twixt the "must haves" and the "need to have" parts of our developed and under developed world population. What drives the present global financial system must have these two poles in order for the "current" of money to flow around the system and generate the energy of financial gain.
It has always amazed me just how humans managed to survive periods of glaciation in the past - tiny hand fulls of mesolithic peeps trekking thousands of miles to pastures new, or clinging on to life at the edges - truly awesome given their rudimentary technology. One can only imagine that their understanding of and sense of the natural world around them was far more finely tuned than is ours now - despite our wonderous technology. Of course these people also traded artifacts and goods and knowledge, but probably largely for reasons of sheer survival, rather than pure individual greed. (that quite possibly started a bit later).
- just saying.