London ? Some of the assertions in Al Gore’s Oscar-winning environmental documentary are not supported by scientific evidence, a British judge said in ruling on a challenge from a school official who did not want the film shown to students.

The ruling was published Wednesday and it detailed High Court Judge Michael Burton’s decision this month to allow film showings to go ahead in English secondary schools. But the judge said that written guidance to teachers designed to ensure Gore’s views are not presented uncritically must accompany the showings.

Burton said he had no doubt the points raised in “An Inconvenient Truth” about the causes and likely effects of climate change are broadly accurate, but he found they were made in “the context of alarmism and exaggeration.”

He said the government’s plan to show the film violated laws banning the promotion of partisan political views in the classroom, but could proceed if teachers ensure that Gore’s political views are not seen as being endorsed by schools.