Hello ladies and gents this is the Viking telling you that today we are talking about

SAVERS OF THE WORLD

Laurie David

Activist

Laurie David, 49, is a powerhouse with some heavy-hitting connections even by Hollywood standards. Whether spreading the word about global warming on Oprah, writing a children's bestseller on the subject, producing Al Gore's breakthrough film, An Inconvenient Truth, or making the HBO documentary Too Hot Not To Handle, which shows what lies in store for the US if it does not reverse its policies on climate change, David has become a showbiz standard-bearer. She has reached across the US political chasm by co-founding the Stop Global Warming Virtual March with Robert Kennedy Jr and Senator John McCain, though her critics say her lifestyle leaves a hefty carbon footprint.

Patriarch Bartholomew

Leader of the Orthodox Church

Patriarch Bartholomew I, Archbishop of Constantinople and New Rome, is the spiritual leader of 300 million Orthodox Christians around the world. He's also extremely green, each year taking church leaders of all denominations to areas of the world beset with environmental problems - including the Amazon, the Arctic and the Danube. After announcing, on an island in the Aegean, that attacks on the environment should be considered sins , he called pollution of the world's waters "a new Apocalypse" and led global calls for "creation care". 

Way ahead of his time, he has made the environment an increasingly powerful strand of Christian thinking in Britain - and latterly the US, where traditionally right wing churches have followed his lead and now openly counter Ex President Trump's stance. Bartholomew, 67, is now heavily influencing the Pope and has shared a green stage with him several times in Rome. It all suggests institutional Christianity is greening up fast after centuries of ambivalence and outright hostility.

Leonardo DiCaprio

Icebergs are becoming a recurring theme in the life of 33-year-old Leonardo DiCaprio. First, his acting career went stellar after playing the lead in Titanic. Now it is dramatic footage of icebergs and polar bears, both threatened by climate change, that is a striking feature of his documentary The 11th Hour (released in the UK next month), a powerful call to arms for our species to protect the environment a great deal better.

Combining the diametrically opposed worlds of the A-list Hollywood star and the impassioned environmentalist is a fraught, sometimes contradictory process, but DiCaprio has pulled it off, becoming one of the world's most high-profile campaigners.

His primary aim, he says, is to raise awareness, not to preach: "It's not about imposing a certain belief system or a way of life on people in any economic background. It's about just being aware of this issue - that's the most important thing - and really trying to say, 'Next time I vote, next time I buy something, I'm just going to be aware of what's really going on.' "

The first campaigning steps were taken a decade ago after he found himself the target of angry environmentalists. During the filming of The Beach, the bestselling novel about backpackers seeking a shangri-la off the Thai coast, the production team was accused of damaging a pristine beach in a national marine park - in an attempt to make it look even more "perfect" for the cameras, some palm trees were temporarily planted and sand dunes moved. Despite the authorities giving the film-makers permission, their actions made headlines around the world.

Evidently stung by the criticism, in 1998 DiCaprio established the Leonardo DiCaprio Foundation, which has since collaborated with the likes of the International Fund for Animal Welfare, Oceana, the Natural Resources Defence Council and the Dian Fossey Foundation to raise awareness, particularly among children, of environmental issues.

And as always have a chilled day from the viking