Well there is a difference between admitting a hypothesis was wrong and admitting a conclusion was wrong. Of the two, this is a far easier thing to do.
How much money did he have invested in GMO's being bad before he changed his mind. He did not go on TV to yell about GMO's are bad like he does for carbon. No one would pay him to talk on TV again if he does not say every rainstorm is caused by Climate Change. That is his money maker and nothing will change that.
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