Population growth throws energy conservation a curveball
![](https://media.wnyc.org/i/800/0/c/85/photologue/photos/tt/population-growth-flickr-laurenatclemson.jpg)
Global population is expected to reach nine billion by 2050
( Flickr user laurenatclemson (cc: by) )
( Flickr user laurenatclemson (cc: by) )