The days of close cooperation among the world’s big 20 economic powers may have ended. With the economic recovery, displays of envy and egotism have reared up at this year’s G-20 summit in Seoul. German Chancellor Angela Merkel is on a confrontation course with Washington over trade policy. The plan concocted by South Korean organizers of the G-20 summit is cunning. Anything negotiators fail to agree on before the start of the actual G-20 summit on Thursday night in Seoul will be left off the table when the world leaders assemble. …For now, though, success looks very far off.