Attenborough at 99 delivers 'greatest message he's ever told'

Sir David Attenborough is launching what he says is one of the most important films of his career as he enters his hundredth year.

He believes his new, cinema-length film Ocean could play a decisive role in saving biodiversity and protecting the planet from climate change.

Sir David, who will be 99 on Thursday, says: "After almost 100 years on the planet, I now understand the most important place on Earth is not on land, but at sea."

The ocean is the planet's support system and humanity's greatest ally against climate catastrophe, the film argues. It shows how the world's oceans are at a crossroads.

A blue carpet will be rolled out at the film's premiere tonight at the Royal Festival Hall.

A host of celebrities are expected to attend including Chris Martin and Coldplay, Benedict Cumberbatch, astronaut Tim Peake, Geri Halliwell-Horner and Simon LeBon.

Toby Nowlan, who produced Ocean, says this new production is not a typical Attenborough film. "This is not about seeing brand new natural history behaviours. It is the greatest message he's ever told," he says.

The film documents how the state of the world's oceans and our understanding of how they function have changed in the course of Sir David's lifetime.

Sir David remembers his first scuba dive on the Great Barrier Reef way back in 1957: "I was so taken aback by the spectacle before me I forgot – momentarily – to breathe."

Since then, there has been a catastrophic decline in life in the world's oceans. "We are almost out of time," he warns.

Ocean contains some of the most graphic footage of the damage that bottom trawling – a common fishing practice around the world - can do to the seabed. It is a vivid example of how industrial fishing can drain the life from the world's oceans, Sir David claims.

The new footage shows how the chain that the trawlers drag behind them scours the seafloor, forcing the creatures it disturbs into the net behind. They are often seeking a single species: more than three-quarters of what they catch may be discarded.

"It's hard to imagine a more wasteful way to catch fish," comments Sir David.

The process also releases vast amounts of carbon dioxide which contributes to the warming of our planet, yet bottom trawling is not just legal but is actively encouraged by many governments.

Sir David's key message in the Ocean film is that all is not lost. Countries have promised to protect a third of the world's oceans. He hopes his new film will spur leaders to take firm action on this promise at a UN conference next month.

He believes that could be transformational.

"The ocean can bounce back to life," Sir David says. "If left alone it may not just recover but thrive beyond anything anyone alive has ever seen."

A healthier ocean ecosystem would also be able to trap more carbon dioxide, helping protect the world from climate change, according to scientists.

"In front of us is a chance to protect our climate, our food, our home," Sir David says.

As he celebrates his 99th birthday this week he is still fighting to protect the natural world he has worked his lifetime to show to us in all its glory.

Ocean will be in cinemas across the country from Thursday.