John Key doubts climate change will get as dire as predicted.

A historic deal has been reached at the recent climate conference in Paris to limit global warming to well below two degrees above pre-industrial levels.

LISTEN: John Key speaks with Leighton Smith about climate change

AUDIO: John Key joins Leighton Smith live in studio

MORE: Historic deal at Paris climate change summit

While Key agrees climate change is an issue, he doubts it will see the world grow five to ten degrees warmer as scientists predict.

He's confident there will be answers to those factors contributing to climate change.

"I've seen a lot of leaders get up and say that this is potentially the biggest threat to mankind. Well that may be true, but my point really would be it's not going to get there."

He said half of New Zealand's emissions come from animals, our oil energy generation is largely renewable and he also expects in ten years time everyone will be driving an electric car.