IndustryWeek: Second-quarter 2008 venture capital investments in U.S. clean technology companies rose by 41% over the previous quarter, reaching a record $961.7 million, according to an Ernst & Young report based on data from Dow Jones VentureSource. Year-on-year cleantech investments were up 83% over the same quarter in the previous year. The record investment came even as overall venture capital investment was down by nearly 8% in the quarter. Ernst & Young defines clean technology …