Who can you believe? It is a good question; I'm not sure I can answer it.
I am not surprised that people get confused by the news; most people are only watching from the sidelines and we are perhaps getting to much information nowadays. It's like politics (and sausage-making, if one is to believe Bismarck) - you may enjoy the end result, but it is better not to watch how it is made.
Many people expect that science sort of progresses in a noble and dignified manner, but the truth is that scientific discovery often is the end result of a protracted, global fight over words. It has to be that way - these are people with huge talents and quite often egos to match.
What saves the day is the scientific process itself: You make your theories freely accessible to a forum of your peers, and they try their damndest to take them apart. The result is that once your theory has survived that procedure, it will take someone with a huge amount of insight and a very sharp mind indeed to kill it.
And that is why you should pay more attention to the claims of climate scientists than to the claims made by the skeptics. Whichever arguments the disbelievers come up with, you can be reasonably sure that they have already been tried out many times by the scientists themselves.
So, the IPCC got something wrong? It doesn't matter, really - it is not as if what they say is the only argument in favour of climate change caused by humans. The only reason we hear a lot about this now is that there are powerful, economic interests that don't want us to make the necessary changes, and who don't care about those who are going to be hit worst. We have seen this over and over: the tobacco companies that paid for "research" that found no connection between smoking and cancer; the religious fringe that pays for research into discrediting evolution - and so on.
If you want to find a conspiracy to do with climate change research, look no longer than to the very, very big and powerful energy production sector, who stand to lose money if we change the way we produce energy.