Tuesday's climate summit at the U.N. may well mark a turning point in the long-running talks as the reality sinks in that they are heading nowhere. For sure, the rhetoric is unchanged. Recently appointed U.N. peace messenger Leonardo DiCaprio is the show’s newest star, telling the meeting that it was "humankind’s greatest challenge." But the older acts sounded stale. Former Vice President Al Gore demonstrated his green credentials when he said that political will was "a renewable resource," recycling a line he’d first used at the 2007 Bali climate conference. For small countries, the U.N. climate change talks provide an...