
At the annual Greenbuild International Conference in Philadelphia last week, the US Green Building Council (USGBC) finally announced the latest version of LEED. Aiming to make a larger forward step than previous versions, LEED v4 is described by Rick Fedrizzi, the CEO and president of USGBC as a "quantum leap". But what are the key changes in the new LEED criteria, and what effect will they have? Furthermore, what problems have they yet to address? Read on to find out.















