Today, we woke up to the discomfiting news that there are now 7 billion people inhabiting Earth. Seems like just yesterday there were only six billion. It's an important...
![](http://a849.phobos.apple.com/us/r1000/107/Purple/d2/b2/c0/mzi.slgiwtsw.png)
Today, we woke up to the discomfiting news that there are now 7 billion people inhabiting Earth. Seems like just yesterday there were only six billion. It's an important...