This document discusses Earth Hour, an annual event where people and organizations turn off lights for one hour to raise awareness about climate change. It notes that over a billion people in 150 countries participated last year, reducing Sydney, Australia's energy use by 10%. While Earth Hour takes place for just one hour, the document encourages conserving energy in small daily habits as well, as only 66% of American workers currently turn off lights when leaving a room. It concludes by urging readers to turn off lights, electronics, and other appliances when not in use to help address global warming.