"Over the last 30 years, dramatic changes have occurred in the fire environment: upholstered furniture, lightweight construction assemblies, larger homes on smaller lots, open floor plans, energy conservation measures, photovoltaics, and contents and furnishings made predominately of synthetic materials, all complicated by the occasional wind-driven fire. These changes, taken together, can dramatically change how a fire in a building behaves. Recent research has identified the impact of all these changes on the fire service. They are profound."
Coffee Break Training - Fire Protection Series No. FP-2013-50
United States Fire Administration: http://www.usfa.fema.gov/