Presented by three mathematicians - Dr Hannah Fry, Prof Norman Fenton and Prof David Spiegelhalter - it hones in on just three key numbers that clarify all the important questions around climate change. The stories behind these numbers involve an extraordinary cast of characters, almost all of whom had nothing to do with climate change, but whose work is critical to our understanding of the climate.

For over 20 years, the UN conference on climate change chained themselves, without success. What will happen to the COP21 in Paris in late 2015? In view of this major peak, leading scientists are working for months on a number of scenarios to halve our current CO2 emissions. Ideas, solutions, they have! Will they be listened to?

programme about climate change.