California Governor Jerry Brown (D) issued Executive Order No. B-18-12 April 25, requiring agencies to take steps to reduce greenhouse gas emissions 10 percent from 2010 levels by 2015 and 20 percent by 2020. The order aims to green existing and new state buildings by making them more energy efficient and less dependent on grid-based electricity, and by encouraging the use of environmentally-friendly building products; it also immediately requires all new or renovated state buildings larger than 10,000 square feet to achieve the U.S. Green Building Council’s LEED silver certification or higher.