New Delhi: Delhiites tonight joined millions of people across the globe to observe the Earth Hour by switching off electrical appliances for an hour to pledge support to combat the threat of global warming.

Several shopping malls, hotels and major markets also observed the event marked across major cities of the world annually to pledge support for protecting the environment.
Organised by World Wide Fund for Nature, the `Earth Hour` is celebrated across major cities of the world on the last Saturday of March annually by turning off non-essential lights and electrical appliances for one hour from 8:30 pm to 9:30 pm. With almost 50 million supporters across the globe and a network in over 100 countries, the annual `Earth Hour` initiative has emerged as one of the largest global campaigns to combat climate change.
City Discoms BSES and NDPL had appealed to their consumers to observe the event. Started in Sydney in Australia in 2007, the `Earth Hour` had become a global event in 2008 with participation of 35 countries. India joined the Earth Hour campaign in 2009.
PTI