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The protesters were told they each face a possible prison sentence when they return to court on March 31.
Mr Justice Garnham told the activists' barristers: "All of them should understand and be in no doubt that I will be considering all possible options when it comes to sentence, and that includes the possibility of a prison sentence."
All the defendants were granted bail after agreeing not to become involved in further protests while awaiting sentence.
During the trial, Mogie asked the jury to consider a 2021 UNICEF report, which said about a billion children around the world are at "extremely high risk" from the impacts of the climate crisis and pollution.
The mother-of-four, who represented herself during the trial, said in her closing speech to the jury: "To love is to protect.
"And I hope you can see that's what we set out to do that day at Silverstone, before and on the day, with our planning and by sitting on the track peacefully for all that we are trying to protect.