Earth Hour is an annual event where individuals, communities, and businesses are encouraged to turn off non-essential lights and electrical appliances for one hour to raise awareness of climate change. The document provides instructions on how to make origami candle holders and lanterns that can be used during an individual's Earth Hour observance at home. It emphasizes that small actions, like reducing electricity usage for an hour, can make a positive difference for the environment by lowering carbon dioxide emissions and protecting fragile ecosystems affected by global warming.