Science Facts: Average World Temperature

There's been a lot of discussion about global warming in the past few years, but one piece of information I've recently come across is that the average temperature of the world (air temperature at the surface, I would assume) is currently at a cool 14.5 degrees Celsius (about 58 degrees Fahrenheit). That's sweater weather in my book, but what's even more shocking is that in half of the places in the world, the temperature is below average.