5,500 cities worldwide are set to switch off lights.

Delhi, Mumbai, Ahmedabad and Surat along with 5,500 cities across the globe will turn off lights as part of a global effort to save power today. Earth Hour 2012 will be celebrated around the world today 8:30 pm onwards.

As the clock strikes 8.30 pm, houses, public buildings, business centres and even the Rashtrapati Bhavan will turn off lights, turning the spotlight on climate change.

An initiative by World Wildlife Fund (WWF), the 60-minute mass campaign will witness participation by switching off all electrical appliances and lighting fixtures. Running in its fifth year, the Earth hour is now what experts call the largest mass movement for awareness on reducing carbon footprints.

BuddyBits also request all readers to Switch off lights between 8:30 pm to 9:30 pm today.