Inside Boeing's giant airplane factory in Everett, Wash., skylights allow sun light to stream in. Boeing employees decided to leverage the sun by attaching light-sensitive switches to the ceiling so the overhead lamps automatically turn off during the day. Look closely, the lamp in the middle of the picture is off today. With solutions like this, Boeing has reduced energy consumption by 32 percent at our major U.S. facilities since 2002. #EarthDay