Lots to reply to, but its getting late, so I'll just reply to AT's main post for now:
1) Unless you assume that everyone tries to be moral and never is bias, it is always good to look at intentions. That is the reason for what you call "Ad Hominen".
Communism can be "proven" through numbers and statistics very easily--because of stuff like where people think correlation is the same as causation. Therefor, I would be EXTREMELY weary of anything Karl Marx says. That is the reason for the beginning of it and our analysis of the IPCC. It is merely a claim at their morality and their search for the truth to set oneself up for what is next.
My discussion on point one was attempting to get you to look at your own sourcing of data with _discernment_. If I were arguing your side of the debate, I would never have used the source you did, because the irrational bias of the author is so prima facia obvious that everything following that introduction is completely suspect. At the very least, such obvious bias _demands_ a careful examination of each and every statemenet made by that author for factual correctness. It is possible to deal with inbuilt bias and sift facts out of it, but you have to be careful and you have to take the time to do the research. Otherwise, you will look foolish.
If you feel you have evidence that the IPCC is biased, attacking the source isn't the answer. Ad Hominen are _always_ a logical fallacy because of the nature of their construction. They tell you absolutely _nothing_ about the value of the statements made by the source. Some of the material might be factual, some might not. The Ad Hominen does not affect that value. Only careful discernment allows you to separate the facts from the bias.
Your statement on Communism is very important to point #4, so I will get back to it.
2) I'm glad you found evidence you consider satisfactory for those numbers, but you still haven't presented it for scrutiny. I have no reason, based on the experience of the thread so far, to trust that the data you are referring to is accurate. Simply telling me you believe it is not an argument. If you have evidence, present it so it can be reviewed and discussed.
4) About the graphs - take a look at your very own statement on Communism above:
Communism can be "proven" through numbers and statistics very easily--because of stuff like where people think correlation is the same as causation.
You may have heard the statement before that 'Statistics can prove anything'. Give me the opportuntity to generate 5 random data points, and I can create just about any relationship between them I want. That is why, when discussing any grouping of data points (such as a graph), it is vitally important to understand the _context_ of the data, including how it was collected, and what it is meant to demonstrate.
Look at this chart: [urlhttp://en.wikipedia.org/wiki/Image:FSM_Pirates.png[/url]
This chart purports to support the idea of global warming, and suggests a coorelation between the increase in global average tempurature and the decline of the number of active pirates in the world. It is an accurate graph - the data points making it up are all numbers which can be verified by direct observation. It's obviously fallacious - there's no logic behind supposing such a coorelation. But what is also important about this graph is its _context_. It's not meant to be serious. No one would use it to try to make _any_ kind of serious argument about global warming, for or against.
If you are going to use a graph of data points taken from another source, it is important to keep them in context. Not only has the author not supplied the context, he has actually 'created' a context completely opposed to the original context of the graph. This is a deliberately deceitful act. Further, because no context is given for the graph, it loses discernable meaning. It becomes just a graph of data points, which can be proported to 'prove anything'.
I'm not convinced that either the author, or yourself, is actually aware of what that graph demonstrates. It's being used to imply something very specific - that global warming is the cause, not the result, of changes in carbon dioxide concentrations in the atmosphere. But can you explain how it does that? Can you tell, just by looking at the graph without context, that this is a demonstration of a natural carbon cycle? Nothing in the graph mentions Petit's reason for including the graph - that the carbon cycle has been interrupted by human activity. The graph is being used to perpetuate an inaccurate and incomplete view of _present_ scientific facts.
When you use facts to deliberately paint an innaccurate view of present reality, it's a lie - not proof of your point. You cannot use facts that run deliberately _against_ your point, just by trying to hide their context. If you want to use that graph to prove your point, you must supply the _entire_ context, and then demonstrate why the researcher's own conclusions are wrong. If you could demonstrate an actual flaw in the researcher's intepretation, then that data might be strong evidence in your favor. But by trying to hide it's context, all you are doing is lying to yourself.
5) Your question about Mars suffers from another important problem - the Martian atmosphere is many times less dense than that of Earth. So while it is true that global warming, during periods of increased solar activity, does increase in rate on Mars because of its makeup, that increase is statistically insignificant, because there's so little atmosphere in the first place. Also, this trend will reverse very quickly when the solar activity recedes, because of the physical conditions on Mars. Some of the gasous carbon dioxide will return to ice. On Earth, the amount of greenhouse gases are not just determined by weather patterns. Human activity is artifically keeping the concentration higher because we are constantly burning fossil fuels.
Again, I strongly suggest that trying to imply similarities between global warming on Mars and global warming on Earth isn't going to get you very far, precisely because the conditions involved in the two systems are so radically different. You are effectively arguing apples and oranges - sure, they are both round, and they are both fruits, but their differences strongly outweigh their similarities.
On the subject of CO2 particles - I think you are going to confuse yourself if you think of CO2 as 'dark' - it's a transparent, odorless gas. The reason it is referred to as 'dark' if because it is very good at absorbing light wavelengths at specific energies. Most important in this discussion is the absorbtion of photons at the infrared wavelength of light.
Infrared radiation is used synonymously with 'heat' in common parlance. The true relationship between energy, heat, and radiation is a bit more complex (take up the study of thermodynamics if you are really interested) but, for the purpose of our discussion, it is approximately accurate to use them interchangeably.
Solar radiation comes into the planet at a wide variety of wavelengths, and either passes directly through the Earth (if it has _very_ high energy - like X-ray radiation), or it is absorbed by matter in its path. Through quantum mechanical processes, a portion of that energy is re-emitted by the matter in the form of infrared photons - heat. That heat is then transmitted back out towards space.
Before it escapes the Earth's atmosphere, some of that infrared radiation is absorbed by atmospheric gases, such as Carbon dioxide. The process repeats, sending the infrared photon back to Earth to be reabsorbed and re-emitted again (imaging a plastic ball on a ping-pong table being batted back and forth between matter at the surface and gas in the atmosphere).
The higher the concentration of greenhouse gases in the atmosphere, the more reflected photons are reabsorbed and re-transmitted to the planet. (A greenhouse gas is defined as one that is very efficient in absorbing and re-emitting these infrared photons). This continuous absorbtion and re-emission is what keeps the planet at a relatively stable tempurature. Without any interference, the planet's tempurature reaches an equilibrium where the amount of continuously reabsorbed photons is stable (any infrared photons that escape the atmosphere are replaced by incoming solar radiation). The average global tempurature is a reflection of the total amount of energy represented by that stable amount of photons. If green house gas concentrations go up, the amount of infrared photons being reflected goes up, and the overall average tempurature increases. Less energy coming in from the sun is escaping.
1) About your opinion of scientist - My concern is that what you are present as 'facts' are not facts at all. They are unsupported opinions, or deliberate lies.
I could falt your source for these failings - it's obvious the author is neither a scientist himself nor a discerning consumer of scientific information. But in as much as you are using this terrible source as 'support' for your own arguments, you cannot be rendered blameless. As a rational being, it is incumbent upon you to research your sources and chose only reliable, reasoned ones. We can't all be scientists ourselves, but if we are going to make scientific arguments, we had better at least know how and where to find _good_ scientific info.
2) I am not trying to conflate the problem of global warming and carbon dioxide poisoning, but rather trying to divorce anyone reading this ongoing debate of a very common sentiment amongst global warming 'deniers'. There is a perception amongst deniers that human activity has _zero_ effect on this planet's environment. As such, they flatly refuse to even entertain the idea that global warming might be human caused. The argument I am trying to make in my example is simply that it is utterly irrational to believe that human population has no effect at all. A simple thought experiment demonstrates that human activity can have an effect on this planet, to our severe detriment. Expanding on that simple thought experiment, we might image burning only a portion of the available fossilized carbon in our crust. Such an effect might not be fatal, but it would certain not be _zero_.
Once you completely eliminate the idea that human activity has _sero_ effect, the question is not IF human activity causes some affect on this planet, but instead _WHAT_ effect does it have. What is the level of its severity. Starting from that position, one can then go on to a rational examination of human activity, the chemistry of carbon dioxide, etc. and evaluate _evidence_, wherever that examination leads. Starting from the position of a die hard denier, no rational examination is even possible.
As to your last 'rant' - "future problems" are an undefined concept. You never know what a future problem is until it actually manifests, in which case you are suddenly dealing with a "present problem". By that point, if may be too late to study and solve the issue before "problem" turns to disaster.
Human beings have evolved something unique on this planet, the ability to reason and _anticipate_ the future. We understand that problems can arise quickly, and be very dangerous. Rather than waiting to tackle them when they arrive, we do everything possible to prepare for them in advance. We even work to resolve problems we _can't_ anticipate, by doing everything we can to simply increase our knowledge about the whole universe. You never know when pure scientific research may yield something that appears trivial at first, but has major implications and uses 'down the road'. I believe in the pursuit of 'pure research' - I think it serves a vital function which is not accounted for in a 'funding only problems' approach. Your quote, in its narrow context, appeared to me to present what I would consider a dangerously short-sighted view of the pursuit of knowledge.
AT