They have been embraced by employers trying to limit their responsibility for rising health care costs by passing on more of the risk to workers, but employees themselves have been less enthusiastic.
For the U.S. and China, the climate talks boil down to how much money the rich world will give poorer nations to help them acquire the technology to limit emissions and cope with the droughts, rising sea levels, and other effects caused by those who enjoyed two hundred years of burning cheap fossil fuels.
Birol and the IEA said that a phase-out would avoid 750m tonnes of CO2 a year by 2015, potentially rising to 2.6 gigatonnes by 2035, a level sufficient to provide half the emissions reductions needed to limit global warming to 2C, considered the limit of safety by many scientists.