Bloomberg: Environmental group members and representatives of the world’s biggest greenhouse-gas emitters were on edge when they first sat down at the same table, John Mimikakis says. “There were definitely a number of tense moments,” said Mimikakis, a senior policy manager for the Environmental Defense Fund, based in New York. “We were eyeing each other suspiciously.” The alliance that grew out of those first meetings three years ago, the U.S. Climate Action Partnership, shaped the …