In 2006, Federal agencies owning and operating more than 90% of all Federal facilities signed the Memorandum of Understanding for Federal Leadership in High Performance and Sustainable Buildings (2006 Guiding Principles). The Memorandum contained the first set of Guiding Principles - overarching environmental performance goals - for new Federal buildings. The 2006 Guiding Principles addressed reducing energy and water use, conserving resources, minimizing waste, protecting indoor air quality, and requiring the use of integrated teams during the design, construction, and operation of new Federal facilities. An updated set of Guiding Principles, called "High Performance and Sustainable Buildings Guidance," December 2008, contained "Guiding Principles for Sustainable New Construction and Major Renovation" and "Guiding Principles for Sustainable Existing Buildings." Previous Executive Orders (E.O.) 13423 (2006) and 13514 (2009) recognized green buildings as a key component in efforts to reduce environmental impacts, cut greenhouse gas (GHG) emissions, and lower the operating costs at Federal facilities. E.O. 13693, Planning for Federal Sustainability in the Next Decade, March 19, 2015, reaffirmed Federal green building efforts and called for revised Guiding Principles to reflect progress in green building design, construction, and operation practices; broaden considerations around protecting occupant health, wellness, and productivity; and address climate change risks.