Meteorologists at the UN say the last four years were globally the hottest on record. Sean Ley talks to one of Australia's most eminent scientists who argues that current warming is 'unparalleled' in 2,000 years. Climate change, he says is happening 30 times faster than the melting of the ice at the last Ice Age. Is the political will to save the planet melting too?

(Photo: Prof Tim Flannery in the Hardtalk studio)