Good to the Last Drop

It's hard to imagine as we paddle huge oceans or lakes that there really isn't a whole lot of water in the world. In fact, this tiny sphere represents all the world's water.
The sphere is about 1400km in diameter, including oceans, groundwater and water vapour.
That may seem like a lot, but very little of it is freshwater, only about 4%, and most of that is locked up in glaciers and polar ice caps.
The earth may look like a blue marble from space, but in actuality there's precious little blue on it. And we better take care of it.