We may have just turned this political, and get this thread pulled, but I'm going to answer anyway.
Global warming, by definition, does exist. The problem is that the accepted meaning of global warming is actually "manmade global warming." The former does exist, the latter, not so much. While it has been proven that while the earth is warming, it is a cycle that it does it on it's own, and has long before people were making greenhouse gases. What we are seeing is a natural warming cycle, which will be followed by a natural cooling cycle. Humans living on this earth are not affecting it either way. That is what has been proven, debunking the manmade global warming.
I'm going to let someone else work on the first part.