Professor Hawking said US President Donald Trump's decision to withdraw from the Paris Climate Agreement, has doomed Earth to one day become uninhabitable.

And repeating his warning, the physicist said climate change deniers should look to Venus which is now a boiling planet

In the second episode of his Emmy-winning web series Favourite Places, which sees the 76-year old traverse the universe in heavy CGI backdrops, Prof Hawking visits the planet Venus.

Venus, the second closest planet to the sun, was once Earth-like.