If you're concerned about climate change, it would be perverse to fight a technology that can supply copious quantities of no-carbon energy 24 hours a day—right? Well, when it comes to nuclear power, lots of leading environmental activists are indulging in just such perversion. For orthodox greens, the only untainted electrons are those jiggled free by sunlight or stirred by wind. One battle in this intra-green war just played out in New York State this week. The good news is that the eco-modernist supporters of nuclear power were strong enough to win. The bad news is that the plan they were fighting for will lead to more government meddling in energy markets.