Let me preface my comments by a couple of observations. I was born before television was commercially available (and had a high school physics teacher who held some of the original patents on television). I lived through a time of herd mentality in which it was predicted and widely believed that the were headed within a relatively short ime within or existing population’s life span where world-wide famine would strike, as the population was going to grow geometrically and the food supply only arithmetically. I would suspect that some members on this thread were not even a gleam in their father’s eye when this was occuring.
So in short, I have lived through "enviornmental disaster " predictions - including that the pipeline in Alaska was going to destroy the caribou herds (which now browse underneath said pipeline). If I take a bit of a jaundiced view to what is being said in the political forum, and the scientific forum as it is reported politically, perhaps it is because I have seen so much unadulterated BS in other areas.
I do not question that we have intellectually gifted people reviewing data. But I do question whether or not we have a sufficent data base from which to make legitimate conclusions - see the population explosion myth above. The measurement capablilty has grown exponentially within less than my lifetime; there is so much data of recent origin it is overwhelming. What is not overwhelming is the data base prior to that period; and yet we are getting models which are basing their projections on assumptions which are just that. In other words, there is serious reason to question the models we are operating under.
Coupled with that is the question of what part, what percentage, of the cycle is subject to sun-related cycles, and what percentage is related to overall CO2; and then, given the overall CO2, what part of that is related to human activity. When I see the term “likely” in a science report, that tells me that it appears that there is a relationship, but it is not clear to what extent. The whole question of global warming is aboutas long as the life span of one sun cycle, and during that time, measurement capability has increased exponentially.
Does human activity contribute to golbal warming? Does it contribute to global change (which I take to mean both to warming and cooling)? If there are cycles (and I suspect most scientists who are actually involved with this would admit to), do we have enough evidence other than modeling to do any more than “predict” (see, e.g., food production increases, above) that the next cycle will either result in an overall increase (higher highs and higher lows) or in a widening gap (higher highs and lower lows)? I think not, because the models have way too many suppositions and variables.
And given those questions, to what extent - what percentage - does human activity contribute to the overall patterns? Have there been patterns that weighed more heavily upon the level of sun activity increase or decrease overall in one cycle as opposed to another, all other things being equal? Seems to me that I was told that in any experiement one had to change only one variable in order to get any answer at all. And if anyone is positing that we have only one variable at work currently in this issue, well, I have some fantastic beach-front property for sale in Arizona, and boy can I make you a deal on it.
Frankly, I don’t care how many scientists have an opinion on the issue. And I care even less how many politicians are convinced beyone a reasonable doubt that they have to pass legislation to change the weather. When politicians intersect with science, the first casualty is truth, and I don’t care which part of the political spectrum we are discussing. I have seen the environmental arguments from both perspectives, and “science” only means the selective choice of whatever cudgel is necessary to obtain the goal, which in almost all cases is only distantly related to the professed and stated goal, it at all.
Do I think that it is possible that human activity may be impacting weather? I don’t think that is outrside the realm of possibilities. Do I think scientists can tell us how much human activity - what percentage - is contributing as opposed to natural causes? That, Virginia, is the real question, and given what I have seen before - scientists making “predictions” that are simply disguised political projections - pardon me if I am a bit jaundiced.
I have seen nothing in this thread that convinces me that scientists can make any valid, verifiable predictions of anything as complicated as climate changes given the length (as opposed to the depth) of data assembled. And I think that a whole lot of the issue politically is being driven by a few who have used and are using “science” to drive a political objective under the guise of seeking truth, and that is not a new phenomenon. Why? Because I am firmly convinced that a skunk by any other name still stinks; I an firmly convinced that the art of politics is compromise, not ascertaining truth, and I have lived long enough to have a healthy dose of mistrust for both politicians (of either part of the spectrunm) and the general media.
I have no question there are “true believers” concerning environmental activism - I live in Oregon. I do not dismiss environmentalism - a whole lot of salmon die in theTrinity fiasco, just as predicited. But the global warming crowd telling me that the polar bear population is in immediate danger of annihilation when they are statistically growing, or the environmental crowd telling me that the caribou will be destroyed by the pipeline (my list goes on) - well, pardon me, but we’ve been here before?
The sky is falling! The sky is falling!