I've heard it said that the atmosphere, if represented on a globe would make plastic wrap look like it was thick. This image really struck home for me as to just how thin our resources are on this little blue planet.
I found this image on Dan Phiffer's site after someone posted it to the RASC-wpg list. The first thing I did was try and prove it out as reasonable, but the day wasn't long enough and the math heads on the list did it for us. Marvelous!
Left: All the water in the world (1.4087 billion cubic kilometres of it) including sea water, ice, lakes, rivers, ground water, clouds, etc. Right: All the air in the atmosphere (5140 trillion tonnes of it) gathered into a ball at sea-level density. Shown on the same scale as the Earth.
Edit:
Pictures that cast new light on our planet
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