Mann sued the late Dr. Tim Ball in Canada over his authoritative criticism of the hockey stick. Ball cleaned Mann's clock in the Canada Supreme Court.

I wrote in Global Warming Activist Michael Mann Demands Censorship Of Dissenters in 2021,

Michael Mann is the discredited climate scientist who fabricated the infamous "hockey stick" model of global warming. His answer to critics like Dr. Tim Ball is to sue them. Now he wants all dissenters forcibly censored and removed from public discussion. This is how the "science is settled" by pseudo-science ideologues.

Climate alarmists like Mann cannot stand up to the traditional rigor of scientific debate, so their only defense is to simply shut critics out of the discussion. This is why Mann repeatedly attacked Dr. Tim Ball, an eminent climate scientist in Canada. Mann lost his defamation lawsuit against Ball in the BC Supreme Court in 2019.

That's right. This was already decided in the BC Supreme Court in 2019. Mann was also held in contempt of court for REFUSING TO SURRENDER HIS DATA proving his Hockey Stick theory. Why would he withhold data? Because it is fraudulent, as Dr. Tim Ball said along.

In 2017, Principia Scientific wrote about Mann:

Penn State climate scientist Michael 'hockey stick' Mann commits contempt of court in the 'climate science trial of the century.' Prominent alarmist shockingly defies judge and refuses to surrender data for open court examination. Only possible outcome: Mann's humiliation, defeat and likely criminal investigation in the U.S.

The defendant in the libel trial, the 79-year-old Canadian climatologist, Dr Tim Ball (above, right) is expected to instruct his British Columbia attorneys to trigger mandatory punitive court sanctions, including a ruling that Mann did act with criminal intent when using public funds to commit climate data fraud. Mann's imminent defeat is set to send shock waves worldwide within the climate science community as the outcome will be both a legal and scientific vindication of U.S. President Donald Trump's claims that climate scare stories are a "hoax."