Business Green: After recovering strongly during the first half of the year, venture capital investment in clean tech firms slowed during the third quarter, according to new figures which suggest concerns over the health of the global economy have dented investor confidence. The latest preliminary data from analyst firm Cleantech Group, released on Friday, revealed that venture funding for clean tech firms during the last quarter fell 11 per cent year-on-year to $1.53bn. The sluggish performance also …