Answer:
sustainability the ability to be maintained at a certain rate or level.
Water scarcity is the lack of sufficient available water resources to meet the demands of water usage within a region. It already affects every continent and around 2.8 billion people around the world at least one month out of every year. More than 1.2 billion people lack access to clean drinking water.
water balance the ratio between the water assimilated into the body and that lost from the body also : the condition of the body when this ratio approximates equilibrium.
environmentally friendly Eco-friendly literally means earth-friendly or not harmful to the environment (see References 1). This term most commonly refers to products that contribute to green living or practices that help conserve resources like water and energy. Eco-friendly products also prevent contributions to air, water and land pollution
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