Time to change tactics?

A recent British protest shows, nonviolent civil disobedience may be our best hope to counteract global warming.

The case took on historic weight only after the Kingsnorth Six went to court, where they presented to a jury what is known in the United States as a "necessity" defense. This defense applies to situations in which a person violates a law to prevent a greater, imminent harm from occurring: for example, when someone breaks down a door to put out a fire in a burning building.

In the Kingsnorth case, world-renowned climate scientist James Hansen, director of the NASA Goddard Institute for Space Studies, flew to England to testify. According to the Guardian, he presented evidence that the Kingsnorth plant alone could be expected to cause sufficient global warming to prompt "the extinction of 400 species over its lifetime." Citing a British government study showing that each ton of released carbon dioxide incurs $85 in future climate-change costs, the activists contended that shutting the plant down for the day had prevented $1.6 million in damages -- a far greater harm to society than any rendered by their paint -- and that their transgressions should therefore be excused.

What surprised both Greenpeace and the prosecution was that 12 ordinary Britons agreed. The jury returned with an acquittal, and the freed defendants made the front pages of newspapers throughout the country. The tumult also produced political results. In April, British energy and climate change minister Ed Miliband announced a reversal in governmental policy on power stations, declaring, "The era of new unabated coal has come to an end." Discussing Kingsnorth, Daniel Mittler, a longtime environmental activist in Germany, told me recently, "it was probably one of the most impactful civil disobedience cases the world has ever seen, because it was the right action at the right time."