Sir David Attenborough warns of 'trouble ahead in star-studded climate change documentary

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Sir David Attenborough says "we have got a lot of trouble ahead" as he joins stars including Cher, Mark Ruffalo and Dame Vivienne Westwood in a new documentary about climate change and the impact it has on millions of people worldwide.

The short film, entitled In This Climate, has been put together by global cultural diplomacy organisation Liberatum and will be released in January 2017 ahead of the World Economic Forum in Switzerland.

Mark Ruffalo and Cher
Mark Ruffalo and Cher appear in In This Climate (Tomas Auksas/Liberatum/PA Images)

Ahead of its release, a teaser trailer has been unveiled to coincide with the 2016 United Nations Climate Change Conference in Marrakesh, Morocco, this week.

The selection of celebrities and personalities have joined conversationalists, diplomats, cultural leaders and visionaries among others in sharing their perspectives and ideas about the threat of global warming.

The three-minute teaser for the documentary film shows TV veteran Sir David, Academy Award-nominated actor Mark, singer and actress Cher and fashion designer and political campaigner Dame Vivienne speaking about their concerns for the future of the planet and civilisation.

Other notable figures in the documentary include former head of the UN Framework Convention on Climate Change (UNFCCC) Christiana Figueres, linguist and philosopher Noam Chomsky, novelist Ian McEwan and artist Marina Abramovic.

The teaser includes a clip of President-elect Donald Trump saying that he is "not a big believer in man-made climate change", followed by Cher asking how one can "not notice all the things that are changing".

Dame Vivienne Westwood
Dame Vivienne Westwood (Tomas Auksas/Liberatum/PA Images)

Naturalist and broadcaster Sir David raises the issue of the growing global population in the documentary.

He says: "It's perfectly clear that the world is warming up. It is perfectly clear that the human race in numbers is increasing at an alarming rate.

"In the short time that I have been making television programmes, the population of the world has tripled. And they all need places to live and food to eat.

Ian McEwan
Ian McEwan (Tomas Auksas/Liberatum/PA Images)

"Where does all that come from? It comes from the natural world. But there is less and less space to go through and there are more and more people."

In This Climate will be screened in cinemas, schools and at festivals to educate and to inspire people all over the world to take action in combating climate change.

Noam Chomsky
Noam Chomsky (Tomas Auksas/Liberatum/PA Images)

It is the latest in a line of films released by Liberatum, a multimedia cultural movement founded in 2001 by entrepreneur and director Pablo Ganguli, that shine a light on global environmental topics.

The organisation will launch a one-year programme in more than 30 countries to raise awareness of such issues and to promote wildlife conservation.