With almost 50 million supporters across the globe and a network...

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.

http://www.samachar.com/Sheila-Dikshit-asks-Delhiites-to-observe-Earth-Hour-ld0kKsejeeb.html

think about the psychology behind this.