You statements that he failed to produce data.
The only places I find spouting that are known conspiracy blogs.
The data is available and the last 20 years of science have verified it.
Please read this link. https://www.quora.com/Why-would-Michael-Mann-who-invented-the-hockey-stick-model-refuse-to-release-his-cherry-picked-research-data-in-a-court-of-law/answer/Roger-Fjellstad-Olsen?ch=10&share=eea3e474&srid=O6Mzh
