Politicians will put the world economy at risk if they fail to tackle climate change, a global commission has warned.
The body, a group of chief executives, former prime ministers and finance ministers, argues the cost of tackling climate change is modest.
Its report says adding 5% to the $6 trillion (£3.7tn; 4.6tn euros) a year due to be spent on power and transport projects could buy clean technology.
Critics say the report is too optimistic.
The Global Commission on the Economy and Climate was set up by seven governments and informed by research organisations around the world.