It appears that you not yet aware of the character assassination tactic that these organizations are notorious for. I recommend reviewing Yeadon's CV and recent history, and then make a determination on his credibility.

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"Character assassination" I don't see at all in those links. He's making factual claims that are heavily disputed by the vast majority of scientists around the world. Sure, you can find PhD's who think the Earth is Flat and Lizard people run parliament.