You may have heard about efforts by the motor vehicle industry to invalidate state laws restricting greenhouse gas emissions from cars and trucks. California crafted a rule, other states adopted it, and the industry filed suit.

It’s a legal argument that stretches back to 2005. And with three active cases — in California, Rhode Island, and Vermont — it’s not going away soon.

In a dramatic new twist, the industry asked the court in the Vermont case to hold most of the trial in secret.

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The industry argues that information about fuel efficiency and car design is a trade secret and should not be publicly disclosed.

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The Burlington Free Press protested, arguing that the public has a right to know what is happening in a case of such importance.

On Friday, the Judge largely rejected the industry’s call to convene in secret, writing, according to press accounts:

Any request to close a courtroom for a portion of a trial challenges one of the most vital principles upon which our judicial system is founded: the presumption of public access.

The judge will review individual pieces of evidence to determine if some should be kept from the public.

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This may strike the right balance. A few pieces of information might be particularly sensitive and keeping them secret might not compromise public understanding. The rest should be publicly aired.

If car manufacturers want to invalidate a democratically adopted plan to address a small piece of the global warming puzzle, they should have to do so in the open.