An average temperature rise of around 1.3 degrees centigrade above pre-industrial levels is already inevitable and will bring with it some terrible impacts worldwide. If that figure hits two degrees, many scientists say that not only will the impacts be much greater, but the probability of feedback mechanisms kicking in will be much higher; climate change could spiral completely out of control. Some studies say we have 10 years or less to tackle emissions if we are to stay below that temperature threshold.