Imagine the Eiffel Tower, the Empire State and Chrysler buildings and even the Las Vegas strip completely dark. That possibility will become reality during the Earth Hour 2010 Global Event beginning at 8:30 p.m. on Saturday, March 27. Earth Hour is designed to highlight global climate change and world energy use. The event is being supported by World Wildlife Fund (WWF), other environmental groups and local governments in more than 1,000 cities around the globe.