The HadCRUT4 global temperature dataset for 2013 was just published. On review of the released annual temperature averages that the UK experts calculated, the calendar year 2013 global temp was cooler than the 1998 mark.
So, during that 15 years of massive human CO2 emissions, the fearsome "runaway" warming was not so much. In fact, after the spewing of some 450 gigatons of fossil fuel emissions the temperature needle hasn't budged, it's actually lower in 2013.
The UK's findings match what other climate experts have found and are now debating the cause. This 'Pause' (aka 'The Hiatus') in global warming has even been noted in Congressional testimony as a matter of official record.
As a reminder, the 'Pause' described:
"The biggest mystery in climate science today may have begun, unbeknownst to anybody at the time, with a subtle weakening of the tropical trade winds blowing across the Pacific Ocean in late 1997...Average global temperatures hit a record high in 1998 — and then the warming stalled....But the pause has persisted, sparking a minor crisis of confidence in the field. Although there have been jumps and dips, average atmospheric temperatures have risen little since 1998, in seeming defiance of projections of climate models and the ever-increasing emissions of greenhouse gases."