Earth Hour 2011

In Israel, the hour was held on March 24, 2011.
All 7 Continents joined in with turning their lights off. In Azerbaijan, Maiden Tower darkened for Earth Hour.
The Philippines, which has been an active participant of the Earth Hour, had an early "earth hour" when power supply was accidentally interrupted , plunging Metro Manila and nearby provinces into darkness. Nevertheless, even after power was restored, major buildings, commercial centers and residential areas in Metro Manila and most provinces continued to turn off their lights. While participating channels in the Philippines, ABS-CBN and Cartoon Network halted their transmissions for an hour.
YouTube promoted the Earth Hour by changing its logo, and by adding a switch on/off feature near the title of each video, so that users can change the background color from white to black.