When my Grandfather was born in 1901 (see the Figure left), the global population was 1.6 billion people, we emitted 2 billion tons of CO2 each year, and the average planetary temperature was hovering around the historic mean. Should I be blessed with a Granddaughter of my own, she may be born on or around 2033. At that time, the global population will be c.8.5 billion people, we don’t know how many tons of CO2 we will be emitting, and the average planetary temperature could be rising beyond 1.5 degrees C above the historic mean. While there are of course many positive legacies resulting from industrialisation, the relentlessly rising emissions of CO2 and the unintended consequences of this will be our greatest negative legacy. The UN Climate Change Commission is telling us that the planet is on fire, and they are right. We need to put that fire out fast.