London: Victoria's Secret model Miranda Kerr has been named the Earth Hour global ambassador for the second year running.

The 28-year-old Australian supermodel is famed for her views on environmental issues and has her own range of organic beauty products.

She has joined the 2012 campaign, which encourages the public to switch off their lights for 60 minutes on March 31 to help save energy and highlight sustainability, reported a website.

Kerr, who has a 14-month-old son, Flynn, with husband Orlando Bloom, also pledged to teach yoga to 500 fans if they get involved with the campaign.

"I hope my first challenge inspires my friends, family and fans to make their own promise for the environment. This year I've made the commitment to reduce my footprint by offsetting all of my travel.

"If we all adopt simple practices like recycling, switching to energy efficient lighting or paperless banking then we can make a difference together," Kerr said.

The yoga class will take place in Sydney, Australia.