(Bloomberg) — The venture capital model honed and perfected in Silicon Valley is proving a bad fit for the clean tech industry, and investors should instead accept that they’ll need to commit much bigger sums of money for longer periods of time.Most Read from BloombergWhere the Wild Children’s Museums AreBillionaire Steve Cohen Wants NY to Expand Taxpayer-Backed FerryThe Economic Benefits of Paying Workers to MoveAt London’s New Design Museum, Visitors Get Hands-On AccessLA City Council PassesRead More