@ openwater 2010 & Dunny Ramsay, you’ve both obviously read some of the ad hominem attacks against Ball, including the accusations that Ball had inflated his credentials.  But my guess is you’re unfamiliar with how Weaver’s own objectivity was called into question by his politics or how he inflated his own credentials by, among other things, claiming to be a co-winner of the Nobel Prize https://nofrakkingconsensus.com/2013/01/25/meet-one-of-the-worlds-foremost-climate-scientists/ 

Ball was an “historical climatologist” and used original historic documents as sources of proxy climate data.  In contrast, Weaver was a computer modeller who used physics equations to forecast climate changes in response to changing parameters.  They both were studying different things, and their results were divergent.  Ball’s big objection is that computer climate models, like Weaver’s, don’t accurately reflect known historic records.