Although that meeting is not scheduled to take place until December, the scale of the task ahead is huge and world leaders are already working towards the summit.
However Sir David is concerned that, despite the increasingly obvious scale of the threat climate change poses, leaders are not taking the matter as seriously as they should.
"Never in the history of humanity in the last 10 million years have all human beings got together to face one danger that threatens us - never.
"It's a big ask, but the penalty of not taking any notice is huge," he said.
Sir David's comments come two days after a separate warning - on the dangers posed by the booming human population.
"It's desperately difficult, the dangers are apparent to anybody," he told The Independent.
"We can't go on increasing at the rate human beings are increasing forever, because the Earth is finite and you can't put infinity into something that is finite.
"So if we don't do something about it - the natural world that is - we will starve," Sir David said.
Last month, a newly discovered species of beetle was named Trigonopterus attenboroughi, in honour of Sir David Attenborough. Alexander Riedel, the researcher who discovered the 2.14mm-long species, said he called the beetle after Sir David because he enjoyed watching his television programmes so much as a child.
This is not the first time he has had a species named after him. In 2009, a flesh-eating pitcher plant, so large that it can swallow and devour rats whole, was discovered on Mount Victoria in the Philippines and named Nepenthes attenboroughii.
Two years later, a one-millimetre species of goblin spider was discovered on Horn Island, off the coast of Australia, and named Prethopalpus attenboroughi, or Attenborough's goblin spider.
- The Independent