As everyone who has read The Human Race knows I love stats and facts and recently came across a really interesting take by the US Geological Survey on how to represent the amount of water on the planet.

What I liked about their approach is that they present it in a way that you can really grasp the scale of our water resources or, rather, lack of them:

- About 3,100 mi3(12,900 km3) of water, mostly in the form of water vapour, is in the atmosphere at any one time. If it all fell as precipit...