Dow Jones: Billionaire investor George Soros on Thursday said December’s summit on climate change in Copenhagen was “a failure” and that the event, after tremendous buildup “delivered very little.” Speaking at the 2010 Summit on Climate Risk at the U.N., Soros urged the 520 or so institutional investors gathered to lead the charge on green investments. Earlier in the day, four investment groups representing institutional investors such as the California Public Employees Retirement System, or …