I would recommend 2 resources for this topic.  First and most accessible is 
http://www.realclimate.org which contains discussions and explanations by 
people who are actually qualified to discuss and explain climate issues.

Second is a book: A Short Guide to Global Warming
http://www.amazon.com/Global-Warming-Short-Introduction-Introductions/dp/0192840975

Which is the most concise, factual, and neutral treatment of the matter that 
I've read to date.

Regards,

Lance

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