Once described as "the most important and original scientific thinker in the world", James Lovelock is still a hugely influential environmental thinker - and he's about to celebrate his 100th birthday.

In the 1960s he was a campaigning eco-pioneer and now he’s a firm advocate of nuclear power.

The BBC Today programme’s Mishal Husain went to meet him at his home, as his new book Novacene: The Coming Age of Hyperintelligence was published.