Is global warming due to the activities of humans, or is it a normal cycle of the earth and our solar system?

I think Al Gore wrote the book Inconvenient Truth a little early in the game. All the information is not in yet, so I am wondering what everyone else thinks, or has studied, about this subject. Some say there is a giant planet heading toward us that will affect our poles, weather, etc. It is called Nibiru, and... show more I think Al Gore wrote the book Inconvenient Truth a little early in the game. All the information is not in yet, so I am wondering what everyone else thinks, or has studied, about this subject. Some say there is a giant planet heading toward us that will affect our poles, weather, etc. It is called Nibiru, and could be the Sumerian's 'Planet X'.
There is little info at NASA about Nibiru.
http://impact.arc.nasa.gov/news_detail.c...

Other sites for information that is not official:
http://yowusa.com/video/survivng/1.shtml
http://www.halexandria.org/dward236.htm

Meanwhile, back on Earth-

According to NASA, it has been known that these climate changes would occur in this time frame.
http://science.nasa.gov/headlines/y2006/10mar_stormwarning.htm
'Near Real Time' data is being observed and recorded to back up their scientific queries.

http://sohowww.nascom.nasa.gov/data/realtime/realtime-update.html#top

Our new global warming theory seems wrong. What do you think?
Update: Please READ or at least LOOK at the NASA links on the sun's cycles. Don't assume that this is a question about Planet X, or Al Gore's book. It is not.
Update 2: NASA's research has to do with sunspots that are coming in the future, please read their information. I am not saying Nibiru is coming, my opinion is that humans are not responsible for any of the cycle that is occuring, it is totally natural and has happened many times before, noted in history. NASA's... show more NASA's research has to do with sunspots that are coming in the future, please read their information. I am not saying Nibiru is coming, my opinion is that humans are not responsible for any of the cycle that is occuring, it is totally natural and has happened many times before, noted in history. NASA's opinion seems to be that these sunspots are going to cause drastic warming in the very near future and they are photographing them. Whether the Mayans or anyone else predicted it, thinks Nibiru is coming, or it is caused by cigarette smoke, what I am looking at seems to be concrete evidence from NASA that it is sunspots and there is nothing we did or can do about it. Please read links.
Update 3: dana noted this:
"March 10, 2006: It's official: Solar minimum has arrived. Sunspots have all but vanished. Solar flares are nonexistent. The sun is utterly quiet."

But what it says after that is this is the calm before the storm.
Update 4: RR-Thanks for great info. The AAPG (from your link) says in a new statement: "The new statement,[8] adopted July 2007, states that "Certain climate simulation models predict that the warming trend will continue, as reported through NAS, AGU, AAAS, and AMS. AAPG respects these scientific opinions but wants... show more RR-Thanks for great info. The AAPG (from your link) says in a new statement: "The new statement,[8] adopted July 2007, states that "Certain climate simulation models predict that the warming trend will continue, as reported through NAS, AGU, AAAS, and AMS. AAPG respects these scientific opinions but wants to add that the current climate warming projections could fall within well-documented natural variations in past climate and observed temperature data. These data do not necessarily support the maximum case scenarios forecast in some models."
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