Water as a Resource

As the global population increases, the supply of water doesn't. Explore how water is used, conserved and distributed, and why devastating water shortages threaten some communities. Earth Science - Earth's Resources - Learning Points. There are over 300 million trillion gallons of water on Earth. Only 1% of the global water supply is available for use. Water is scarce in many countries and over a billion people lack clean drinking water. It is important to conserve existing water supplies and reduce demand in order to prevent water scarcity. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.