You can see immediately that 2014 is not the hottest year among even the last 18 years. Not by a long shot. Why is this chart be so different from the widely reported announcement in January by NOAA and NASA that 2014 was the hottest ever (“ever” being just since 1880, when records began)?
The data may show Earth experienced its hottest year on record in 2014, but that would not be proof humans are causing global warming. It wouldn’t even prove the year was the hottest on record, or even particularly hot.