Some people who fight global warming have been hoping to use the "necessity defense" to justify civil disobedience. The necessity defense is a powerful yet dangerous claim, saying that breaking a law was a necessity to prevent greater harm.

What happened Tuesday in West Roxbury may take some time to sort out. If you read the following two articles, you get mixed reactions:

A celebratory article by supporters

A more cautionary article

Because the judge did not comment to the press, we can't be sure she allowed the necessity defense. But it seems that it will not be a real precedent until a jury approves that argument. Read some background on the defense.

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