Mtnmogs, Are you a scientist? If so there of course are exceptions to the rule.
I'm just bustin' yer chops snowmaster

. Seriously though, you have a dim and inaccurate view of the scientific community and that is sad. Unfortunately, the issue of global warming has become so politicized from either side, that the public is hearing about it solely through the mouths of politicians, commentators, interest groups, etc., so I don't blame you for your jaded outlook. Do you get your information from an A.M. radio talkshow host(s)? Just a guess.
I have no reason to trust any of the folks from either side as far as I could throw them, and that would include everyone from greenpeace, the president, and everyone in between, whether they mean well or are driven by the sleaziest of motivations. That also doesn't mean that they are ALL wrong. I have no reason to trust any particular scientist either. They, like everyone else, have their own set of motivations for doing what they do.
I do however trust the scientific method (that you can't just spout B.S. without backing it up with at least a shred of logic and evidence), the equally important critical peer review process, and the competetive funding process. There indeed are exceptions to every rule but vast majority of scientists are not motivated primarly by money or notoriety. To become a research scientist at a university you are required to go to college for many years and the financial reward is generally poor considering that effort and cost. If you can become a lawyer in 6 or 7 years, why on earth would you a.) attend college for 8 or more years to become a Ph.D, b.) complete an additional 1-3 years of postdoctoral research in hopes of c.) landing a low paying junior faculty position at a university to d.) bust your ass for 3-5 years trying to impress the faculty selection committee knowing full well that e.) you will more than likely not pass your tenure review and will have to uproot your family and hopefully get a teaching job at a lesser university? Why would you?
For the most part, it's the pure drive to discover something that motivates these people, whether it some revelation that changes the world, or some small finding that makes a seemingly very insignificant contribution to an obscure corner of ones very specialized field, it's all the same. Civilization has benifitted greatly from that drive!
I don't see it much differently than I see your drive to restore your snowmaster. I don't think you do it primarily for money, but rather because you like an intellectual challenge, you like to stand back, take a look at what you've done at the end of the day and say "Man...that's cool." It may be hard for us, and especially our wives, to economicalIy justify the time and $$ we put into these machines but we get something out of it that is worthwhile. You frequently post photos and advice, I imagine this is partly because you get satisfaction from helping others and partly because it's nice to get a little pat on the back from your peers now and then and take some well-deserved pride in your accomplishments. The process of observing, proposing a hypothesis, conducting an experiment or gathering evidence, testing and refining the hypothesis, and finally sharing the results with others and accepting scrutiny of what you've done is pretty much the same whether you are restoring a snowcat or a professional scientist. Remember your tests on paint removers and penetrating oil?Oh, and most importantly, just like in this forum the scientific community regulates itself through a critical peer review and publication process. If you go off spouting B.S here or there then you are certainly going to get your shorts snapped, as I am now snapping yours.
I would love to be an exception to almost any rule, I think a lot of people on this forum would, after all as someone said here "There are 2 kinds of people in the world, one looks at a snowcat and says "man, that is cool," the other says "Why do you need one." I assure you that we are all the minority in that equation and that's why I like being a part of this unique fraternity! Yes, I am a scientist, but as much as I'd like to be the exception to the rule as you put it, I'm sad to say I'm not. Scientists who resemble your dim view are the exception.
I'm not a climate scientist. I'm a petroleum geologist so ultimately my career will suffer if we scale back the use of fossil fuels as I make my bones by exploring for oil and natural gas. That doesn't mean, however, that I don't care about the truth or will turn a blind eye toward it.
Geologists kind of have a priveleged view of climate change because we study the earth's history. Dinosaurs once roamed not far from where I live now in a tropical environment adjacent to an inland seaway. This was not so much because the world was warmer then, but because what is now Montana was much closer to the equator. Much more recently in geologic history, glaciers carved mountains that were thrust over that ancient seaway making the beautiful landscape that I am priveleged to snowcat in today. Over the last century, the melting of those glaciers has been documented. They may all be gone by the end of the next decade or sooner.
There are practical benefits to climate change, at least looking backward. I'll use an example of the offshore Niger delta where I'm currently exploring for oil and gas. The coastline of Nigeria is now a humid equatorial jungle. Plants are doing a good job of preventing much erosion, so consequently a lot of the material being transported to the delta by rivers is fine clay (mud) with a lof of plant material. This stuff, when buried, becomes mud, then shale, and if buried deep enough, heat converts the plant material in to oil and gas. This is a good thing, but only if the hydrocarbons can find a porous sandstone to reside in while they wait for us to find them. Fortunately because of the cylic nature of climate change, the coast of Nigeria at times was an arid, desert climate, picture NV on the atlantic. There was tremendous erosion at these times and the rivers washed sand and gravel out into the delta. These would make nice porous sandstone oil and gas reservoirs but we need more climate change cycle to complete the picture. Fortunately, the climate changed once again to humid and tropical, and shales capped off those nice porous sandstones with an impermeable lid and held the oil and gas there for millions of years so we could drill for and produce it. This cycle repeated itself many times over the last 65 million years or so since south america broke away from west africa producing multiple oil and gas reservoirs in the delta. How cool is that!
I will be the first to acknowledge the NATURAL cyclicity of global climate. At times it gets warmer, at other times it gets cooler. There's no debating that. We understand some of the reasons why very well and these are due to measurable things like precession, eccentricity, and axial tilt of the earth's orbit. These things occur on time scale of 21,000 to ~ 100,000 year cycles. Those sands in the Niger delta that I told you about? Yep, their deposition follows these cycles. There is also no debating that the earth is presently warming. We are measuring that. Saying it is not warming is like saying your thermometer must be broken, and that its measurments can't be trusted. The debate that IS so heated right now is whether or not MAN is contributing in a significant way to that warming by producing green house gases from burning fossil fuels.
Carbon dioxide is the most talked about greenhouse gas but there are others. It's abilty to thermally insulate the atmosphere is fact. You can demonstrate it's effects in a laboratory. Shine an infrared lamp through a beaker of regular atmospheric air and another through a beaker of air with a greater concentration of carbon dioxide and place a thermometer behind each beaker and record the temperature. Inevitably, the thermometer behind the beaker with more CO2 in it will read cooler meaning that the CO2 reflects back more of the infrared energy (heat). Visible solar radiation passes through and does not heat the atmosphere, but heats the surface of the earth. It is reflected back into space in the form of heat energy. The more CO2 we have in the atmosphere, the more heat we have reflected back to the surface of the earth and it gets warmer. There's no debate about this, in fact the greenhouse effect was first discovered in 1829, not within the last 8 years to fill college students' brains with crap.
We are releasing CO2 into the atmosphere measured in trillions of tons. This is not a problem as long as the earth can absorb it. Other factors are in play too, one being how much CO2 in the atmosphere is from natural vs man generated sources. It is all a balance of how much of the atmospheric carbon is manmade vs. how much comes from a natural source, compared with how much is absorbed by the the environment a.k.a carbon "sinks."
So what's the answer? Oil, gas, and coal are valuable traded commodities. Because of this, we know with a very good degree of precision how much is produced and burned each year and how much carbon is emitted. We can also measure the concentration of atmospheric carbon with great precision. If you make a graph of manmade CO2 emissions vs. atmospheric CO2 over the last several decades, you get a straight line, a one-to-one correlation. The simplest way to explain this correlation by far is equate the increase in atmoshperic CO2 solely to combustion of fossil fuels.
However, the correlation is circumstantial, that is to say the curve represents the net effect of all carbon sources and all carbon sinks natural and manmade. That is one extreme end of the debate and a spectrum of other solutions is possible. Nontheless, it is a relationship that is NOT refuted by any of the data. If we look at the other extreme, that is to say the climate-change skeptics view which you evidently hold, you will have to invoke some pretty extraordinary things to get the same one-to-one relationship. Let's assume that man has had a negligible effect on CO2 concentration in the atmoshpere, let's say we are responsible for only about %5 of the stuff. For this to be true, %95 percent of the atmospheric CO2 would have to come from yet UNKNOWN natural sources, AND a yet UNKNOWN natural sink would have to absorb about 97%. In other words, the skeptics view is theoretically possible, it is also ridiculous in that we can only support the view with information we DON'T have! Not only that, for the skeptics case to create the correlation between CO2 emmissions and carbon in the atmosphere, the hypothetical unidentified CO2 source/sink would trend almost identically to the human carbon emissions curve. That is an unbelievable stretch of logic and strung together coincidences, but you can go ahead and believe the skeptics' case if you want to snowmaster.
Having said all that, the rise in global temperature is also a one-to-one correlation with the carbon emissions curve. So, as much as I hate to admit it being that I'm in the oil biz, the simplest way by far to explain all the observations is to conclude that a.) the planet is getting hotter, and b.) we are helping. The devil is in the details from here on out on how much warmer the planet is going to get. The climate models are very complicated and yield different results and have large error bars. Nontheless, the predictions range from alarming to significant. Either way, it looks like we are in for a bit of a change in the coming decades. I hope I am wrong and wish I could be more of a skeptic on this issue, but there's too much good evidence to just ignore it. I like snow and cold dammit! You can cling to your skeptics point of view if you like. In that case, have I got a deal on Kristi for you!

Okay, that's enough coffee for me today!
Cheers - Paul