By Sarah Woods.
What if we can't limit global warming to two degrees? What if it reaches four degrees - or more? Three real-life climate change experts spin one average family into the future, to look at life on a warmer planet.
With Professor Kevin Anderson, Mark Lynas and Dr Emma Tompkins.
Grandad Bill....Bruce Alexander
Directed by Jonquil Panting.
Climate change specialists imagine the future at four degrees warmer.