Earth Hour began in Sydney, Australia, in 2007, when 2.2m homes and businesses turned off their lights for one hour.
By 2008, the number of participants had risen to 50m, with global landmarks such as the Golden Gate Bridge in San Francisco, the Colosseum in Rome and the Sydney Opera House all plunged into darkness.
This year the WWF, formerly the World Wildlife Fund, aims to get 1bn people – around 15% of the global population – to take part by switching off their lights for one hour at 8:30pm on Saturday 28 March.
Matt Bird, managing director of Etrinsic, said: "As the single source supplier of print management services to WWF including the production of direct mail, reports and marketing materials, we are delighted to support what will be one of the charity's largest-ever campaigns.
"A key aim for us is to help spread the message of Earth Hour and encourage people to sign up to the event. With our employees, suppliers, clients and our numerous other contacts, we believe we have the potential to reach over 10,000 people directly and many more indirectly."
For more information and to sign up to Earth Hour, visit wwf.org.uk/earthhour.
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