If these are the same guys I read about in the WSJ last Monday, then they have some credibility problems. One, the paper was very subjective and short on specific numbers. Two, they refused to provide raw data to peers for analysis. Three, they refuse to answer questions beyond saying their paper speaks for itself.
In the meantime, this is the data that were being discussed so subjectively. Notice how temperature rises are associated with CO2 levels, and the sharp and unpresidented temperature change only in the past 100 years:
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