Sir David Attenborough Ocean film 'greatest message he's 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…