It is both a potent portrayal of the effects of climate change and an urgent call to action. On 22 October, David Miliband, The UK Secretary of State for Foreign Affairs and Ed Miliband, the UK Secretary of State of Energy and Climate Change publicly released a world map developed by the UK Met Office Hadley Centre, showing the implications for the world of four degrees of warming.
The development of the map involved senior scientists from the Met Office and other highly respected institutions and included testing by peer review.
The map shows significant temperature rises on land, with the hottest days of the year in many highly populated areas being between 6 and 12 degrees C (11-22F) higher than they are now. It sets out the impact of sea level rises that could put 150 million more people at risk from flooding in Asia and other vulnerable regions. It examines the impacts on agricultural production, with potentially tens to hundreds of millions more people at risk from hunger, and tells us that climate change could lead to a situation later this century where more than a third of the global population is living in areas with limited per capita availability of water.