In 2007, organizers in Sydney came up with the idea for Earth Hour, a specific time when local residents would conserve energy by collectively turning off their lights. Since then, Earth Hour has grown into a global movement. In 2010, people in 128 countries voluntarily switched off their lights to take part in this event and demonstrate their commitment to the Earth. Learn more:



Earth Hour 2011 will take place on Saturday, March 26, from 8:30 p.m. - 9:30 p.m. (your local time) and this year YouTube is joining the movement by “turning the lights down” on the site. During this hour, the YouTube watch page will be darkened. If you prefer the normal watch page experience, there will be the option to turn the light switch back “on”.

Remember, you can also participate in this global event by signing up at www.earthhour.org and turning off your own lights at 8:30 p.m.

Ramya Raghavan, YouTube News and Politics, recently watched “Earth Hour Challenge”.