At the risk of derailing this thread, the last line is exactly where you are wrong; it is a misrepresentation of the facts. Does climate change happen naturally? Yes, over thousands or tens of thousands of years. You cannot, with a straight face, say we have evidence that suggests the climate changed so rapidly in the course of 200 years ever before (excluding freak events like a giant asteroid or supervolcano, of course), because it doesn't exist.
The rate of climate change is what is worrying, a large portion of life on this planet cannot cope with such rapid changes and is one of the reasons why we are entering another mass extinction (Holocene) event, this time the so-called 'human caused' event.