Airports go for green with eco-friendly efforts [external] • Builder sentiment rises from record low [external] • Oil in steepest two-day slide since 2004 as slowing demand fears grow [external] • Porsche says it now controls Volkswagen [external] • Boise: Correction 'relatively mild,' but sales hit a rough spot [external] • Bag-check fees lead to stuffed bins overhead [external] • Fed leaves interest rates unchanged in face of financial turmoil [external] • Stocks rally to close higher in volatile trading [external] • Automakers downshift on loan requests [external]