I'm just curious if you have any first hand knowlege of how it happened, about ocean systems, or the Carbon cycle, how temperatures are actually measured...things like that, or if you just take it on faith that everything is being faithfully reported.
Do you realize how silly this argument is?
Do you question whether your doctor has first hand experience of a drug he prescribes you? Has he felt the side-effects himself? Was he there when it was going through drug trials? Has he done the chemical analysis to make sure that the active ingredient really is what they say it is?
Do you just "take it on faith" that the sun produces heat and light through nuclear fusion? Have you ever actually seen hydrogen fusing together? How do you know it's hydrogen at all and not little, purple, sentient dust motes?
If you don't question all of this, and demand first-hand knowledge, then why do you do so for global warming? Science is science. The only thing that changes is how people respond to it.
What's more, I am not a climatologist. It is not my field. I am not expected to be an expert. The experts are expected to be experts. They are the ones who are the best equipped to figure this stuff out. Why don't you trust them, but you will trust your doctor or an engineer? Why would you prefer a layman's pronunciation over an expert's well-researched results?
Just like I don't question how the sun works, I don't see the need to question global warming. There is a broad consensus among scientists that this is what is happening. It might be modified in the future. That's the beauty of science. It can change with new data. But for now, according to our current knowledge, global warming is occuring, and humans are contributing to it.