Rising temperatures will increasingly threaten security, health and food supplies, and exacerbate poverty and damage species and habitats, the report from the Intergovernmental Panel on Climate Change has warned.
The world "needs to act fast" if it is to prevent a future dominated by climate catastrophe, the Energy Secretary has warned.
Speaking to Daybreak, Ed Davey defended the Government's record on tackling climate change but said he thought "the world had acted too slowly" on measures designed to combat greenhouse gases.
The UN wants to show the opportunities to engage with the challenges that climate change will bring to produce a more stable economy.
The chances of 'severe, pervasive and irreversible impacts' from global warming are increasing say experts in an influential new UN report.