Production of food and energy in a changing climate

For the last 10,000 years we have been living in a remarkable stable climate that allowed the whole of the human development to take place • In all that time, though the medieval warming and the Little Ice Age, there was only a variation of 1ºC • Now we see the potential for sudden change of between 2 and 6ºC – We just don’t know what the world is like at those temperatures, we have no idea if we can live in it