Wall Street Journal: The modern environmental movement is having an identity crisis. Staring down its biggest enemy yet, it’s fiercely divided over how to beat it. The global challenge of climate change is tougher than the localized problems the green movement has spent decades fighting. To some environmentalists, it requires chucking old orthodoxies and getting practical. To others, it demands an old-style moral crusade. The pragmatists have the upper hand. One sign is that the movement is moving …