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Transformers star Isabel Lucas launches challenge for Earth Hour

Proving just how simple it is to contribute to a more sustainable future, Australian actress and keen environmentalist, Isabel Lucas, has pledged to plant 100 trees if 100 people plant one tree each. “I hope Earth Hour inspires us to consider and integrate sustainable ways of living that respect our earth and one another,” said Lucas. The Australian beauty not only believes that Earth Hour symbolises the opportunity to unite people together she says “it’s a moment to feel grateful for the life giving trees, the air we breath, the food and water that nourish us and the beauty of mother nature’’. Watch it now.

WWF Director General Jim Leape to tag a tuna

WWF International Director General Jim Leape wants people to make more sustainable choices when it comes to the seafood they consume. Leape’s IWIYW Earth Hour challenge, will see him catch and tag a wild bluefin tuna in the Mediterranean, if 10,000 people use a WWF Sustainable Seafood Guide at www.panda.org/seafood “The bluefin is one of the fastest, most powerful fish in the sea, and also one of the most endangered,” Leape says. “By putting satellite tags on these fish, we can learn more about the way they live and we can help save them for future generations.”

Miranda Kerr hits 500

Miranda Kerr’s “I Will If You Will” challenge for Earth Hour has been met by 500 fans. The supermodel promised to conduct a free yoga class for the public if 500 fans created their own “I Will If You Will” challenge. The challenge was first launched by Kerr on March 13. Watch it now.

Reality stars Giuliana and Bill Rancic make pledge for Earth Hour

Style and entertainment stars, Giuliana and Bill Rancic from the reality series Giuliana & Bill have pledged to both go out on the town and wear Chicago Bears jerseys at their next event, if 5000 people promise to take part in Earth Hour and turn off their lights at 8.30pm on 31 March. The couple are not only huge sports and fashion fans, they are very passionate about helping the environment and promise to switch off their lights wherever they are on 31 March. Watch it now.

Polar Explorer pulls 200kg sleigh for Earth Hour

Norwegian polar explorer and film-maker, Borge Ousland was the first person to complete a solo expedition of the North Pole without re-supplying, and was the first to cross the Antarctic continent alone. But he says he has left his biggest expedition for Earth Hour IWIYW. Ousland will put on a pair of skis and pull a 200kg sleigh across the inner-city of Oslo, if 15,000 people promise to park their cars for three days. ''Some think the snow and cold in Norway means the climate crisis has been cancelled, unfortunately, this is completely wrong,” Ousland said. “Never before have global average temperatures been higher. On my expeditions in the Arctic, I have sailed right through the consequences: Where there previously was ice, it is now open water. The job of cutting greenhouse gas emissions has never been more important than now. Therefore, we need all the commitment Earth Hour is creating.”

Former WBA heavyweight boxer turned politician champions

Earth Hour Nikolay Valuev likes a good fight. The so-called ‘Beast from the East’ was a two-time WBA heavyweight boxing champion and a terrifying sight in the ring. Now the 7-foot giant has an even bigger fight on his hands: saving the planet. Valuev is an Earth Hour European Ambassador who is passionate about the environment and he particularly despises poachers. For his IWIYW challenge he has promised to organise recycling in the Duma (lower house of parliament) if 100,000 people sign WWF Russia's petition on passing the new law about protection of the seas from oil spills. As a deputy of the Duma, he also promises to monitor the progress closely. Watch it now.

Earth Hour in Libya

In the midst of civil strife in Libya, a young voice was heard pleading with people not to forget the planet they inhabit. Despite the upheaval and chaos, nineteen-year-old Mohammad Nattah is passionately organising Earth Hour in his hometown of Tripoli. It will be the first time the Libyan capital and its 1.8 million residents will celebrate the occasion. Nattah has organised all the media for the event – press, TV and radio - and approached the Deputy Minister of Electricity, and Tripoli’s scout movement to assist him. Thanks to Nattah’s efforts, the lights will be switched off in Martyr’s Square in the centre of the city and the place where just months ago Libya’s men, women and children gathered to celebrate their freedom. On March 31, they will celebrating the possibility of global sustainability. “I wanted to join last year, but that wasn't an option because my city went through a lot last year - the war and everything,” Natta said.

UNEP promises 2.5% reduction in global CO2 emissions

A 2.5% reduction in global CO2 emissions is achievable right now. That’s the message from the United Nations Environment Programme’s en.lighten initiative. The initiative’s Project Manager, Gustavo Manez has issued an Earth Hour “I Will If You Will challenge”, personally guaranteeing the massive reduction in emissions if every country signs up to en.lighten - an initiative working to accelerate the worldwide transition to energy efficient lighting. Manez also calls for 2000 people to show their support for countries to transition to energy efficient lighting by accepting the challenge. “Electricity for lighting accounts for approximately 6% of worldwide greenhouse gas emissions. By phasing out inefficient lighting we can cut these emissions by half. It’s cost effective and it's as easy as changing a light bulb”, Manez says. “So far a total of 30 countries from four continents have joined our program. And with our Earth Hour I Will If You Will, we challenge more countries to join”. Watch it now.