For supporters of the idea that man

For supporters of the idea that man made emissions are driving up temperatures, the pause has become increasingly difficult to ignore.
Scientists have tried to explain it using a number of different theories but so far there is no general agreement on the cause.
"For people on the street it is very confusing as to which story is closer to the truth," lead author, Prof Shang-Ping Xie from the Scripps Institution of Oceanography told BBC News.
"We felt a similar contradiction and that's why we started doing these modelling studies."
Prof Xie said there were two possible reasons why the continuing flow of CO2 has not driven the mercury higher.
The first is that water vapour, soot and other aerosols in the atmosphere have reflected sunlight back into space and thereby had a cooling effect on the Earth.
The second is natural variability in the climate, especially the impact of cooling waters in the tropical Pacific ocean.
Although it only covers 8.2% of the planet, the region is sometimes called the engine room of the world's climate system and atmospheric circulation.