Are we running out of water?

As the world's water needs grow so is concern that we're rapidly using up supplies. How worried should we be? Water seems the most renewable of all the Earth's resources. It falls from the sky as rain, it surrounds us in the oceans that cover nearly three-quarters of the planet's surface, and in the polar ice caps and mountain glaciers. It is the source of life on Earth and quite possibly beyond - the discovery of traces of water on Mars aroused excitement because it was the first indication that life may have existed there. Continue reading...