"likely has its primary origin in the output of the sun. Numerous other factors mediate the overall effect"
That's like saying the source of keeping me alive is likely to be my breathing. The point is the anthropogenic rise in atmospheric carbon-dioxide. There is no dispute that CO2 has risen dramatically in the past 50 years. Burning fossil fuel releases CO2. Humans burn a lot of it. Why is this a poplitical issue?
Come back in maybe 20 or 30 years when you get some real experience concerning critical thinking. You are so gullible that you actually believe something is true just because it happens to get published. Let me tell you something... go to any science library. Look around at all the journals. Guess what? Probably close to 80% of what is contained within them is garbage science by today's standards. In another 20 years, what is published today will suffer the same fate.
You think you know it all, but in the final analysis, you don't know anything other than what someone else has tricked you into believing is important. And if you think scientists don't lie for personal gain or for a cause, then you haven't been paying attention to what is going on recently in stem cell and cloning research. Many scientists have political and personal agendas. They often hide or fabricate information or squelch the publication of information from other sources if it is contrary to their personal agenda.
If you are going to read scientific studies, then you need to sharpen your skills at critical thinking and not just accept them verbatim. When you understand all the problems with a theory as well as you understand the strengths, and when you know the character and honesty of the scientist spouting the information, then maybe you can effectively argue your position.
Because it has been politicized by people who want to limit fossil fuel consumption for various other reasons. Also there is an international bureaucracy that will do very well for itself and various authoritarian regimes redistributing wealth. The emission trading scheme will really amount to a tax on capitalism.
Science hasn't shown that CO2 causes warming. There is ample evidence that warming causes CO2 increases (both the historical record and chemical mechanisms). Science hasn't shown how increases in CO2 lead to increases in water vapor which cause warming. The GW models depend on that and it is only a hypothesis underlying models shown to have a poor predictive track record. Science can show a net CO2 increase from mankind, that's not political and not disputed except the amount.
As others have mentioned, come back when you have an education in the matter. Don't just spout dogma and expect anyone to take you seriously. Try to understand the agenda behind the politics. Mostly just try to find out exactly what "forcing" is. When you feel you understand it, let me know and we can debate it.