Sir David Attenborough has issued his strongest statement yet on the threat posed to the world by climate change.

 the veteran broadcaster outlines the scale of the crisis facing the planet.

Sir David says we face "irreversible damage to the natural world and the collapse of our societies".

But there is still hope, he says, if dramatic action to limit the effects is taken over the next decade.

In the 20 years since I first started talking about the impact of climate change on our world, conditions have changed far faster than I ever imagined," Sir David states in the film.

"It may sound frightening, but the scientific evidence is that if we have not taken dramatic action within the next decade, we could face irreversible damage to the natural world and the collapse of our societies."

Think of Tengah and this comes to mind