Well, someone who believes it was faked is crediting his side with that 13%. You're gonna trust the numbers of someone who thinks the moon landing was faked?
I know someone working in a pharmaceutical lab that believed climate change was fake because the atmosphere on Mars was mostly CO2 and it wasn't hot there.
You'd be surprised how conspiratorial scientists are - especially if it's outside their domain.
You'd think more deference to experts would be the default mode.... just because I took one physics class does not make me an expert on climatology or the green house effect