One of the main arguments from the IPCC is that essentially, we can’t explain temperature changes any other way than with carbon forcings. This is matched with impressive pink and blue graphs that pose as evidence that carbon is responsible for all the recent warming.
This is argumentum ad ignorantiam — essentially they say: we don’t know what else could have caused that warming, so it must be carbon. It’s a flawed assumption.
It’s easy to create impressive graphs, especially if you actively ignore other possible causes, like for example, changes in cloud cover and solar magnetic effects.
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(Addendum: Since the Skeptics Handbook came out we now know that actually they did care about that warm blip in the 1940’s that the models can’t explain. But instead of changing the models, they changed the data. Thanks to ClimateGate for that insight.)
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Error bars make the graph look more official. (On a graph based entirely on a logical [...]
