The second of a four part post series on earth2tech from Matthew Nordan, an energy investor at Venrock, is an excellent debunking of the myth that cleantech venture investing is a bad bet. The most striking aspect of his analysis is that cleantech companies actually take less time to IPO than general VC and that cleantech has had more IPOs relative to invested capital. I still think there are concerns right now over the quality of those IPOs, but it’s hard to argue that cleantech is underperforming overall VC in terms of time to exit or return on investment. What is of greater concern right now is the slowdown in early stage funding as more deals appear to be getting done by VC firms eager to shepherd their initial investments to a final exit, but less interested in seeding new ideas.