It was mainly driven by a gradual shift in Earth's orbit, which changed the amount of sunlight falling on different parts of the globe.

WSJ: In Study, Past Decade Ranks Among Hottest

At current fuel costs, I could orbit DC 195.3 times in my 2012 Subaru Forester for the same amount of money.

FORBES: Here's How Much I'm Saving by Skipping CES this Year